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Aurora Reversal Suite

Official User Manual & Strategy Guide (v1.0.23)

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0. Quickstart Guide

Follow these 5 steps to catch your first trade with Aurora.

1
Check the Bias

Look at the Bias Dashboard (top right). If Cycle Flow and Intraday Trend are both Bullish, look for Buys. If Bearish, look for Sells. When mixed, use Simple Sweep mode or sit out.

2
Wait for a Trigger

A trigger is a Liquidity Sweep ("S") of a key level, a rejection of a 5m/15m/1H FVG, a Narrative FVG touch, or a POC touch.

3
Identify Entry

Look for an Inversion FVG (colored box) to form immediately after the trigger. This is your entry zone.

4
Confirm Signal

Wait for a Buy or Sell label. This confirms all active filters (Bias, ADR, Strong Close, SMT if enabled) have passed.

5
Execute

Enter on candle close. Set SL at the recent swing (Fractal Pivot). Target the opposing liquidity: next PDH/L, Session H/L, or Range extreme.

1. The Dashboards

Aurora provides three at-a-glance overlays to keep you aligned with the higher timeframe narrative.

A. Bias Dashboard (Top Right)

Enabled via Show Bias Dashboard. Displays the current narrative state in a compact panel.

RowWhat it Shows
Cycle BiasERL/IRL engine result β€” Bullish Expansion, Bearish Expansion, Bullish Retracement, or Bearish Retracement.
TargetNext draw on liquidity β€” e.g. "External High" or "Internal FVG".
PricingPremium (>50%) vs Discount (<50%) of the daily range.
ADRToday's range as % of the 10-day average. >100% = day likely exhausted. <100% = room to move.
Liquidity StatusTracks Weekly, Daily, and Session levels. βœ” = level already swept. Visible with Show Liquidity Pools on Dashboard enabled.

B. MTF Trend Table (Bottom Right)

Enabled via Show MTF Trend Table. Shows pivot-based trend direction across seven timeframes using configurable Struct Pivot Left / Right lookbacks.

TimeframesPurpose
5m, 15m, 30m, 1HUsed internally by Strict and Super Strict signal filters. If all are bullish, Short signals are blocked in Super Strict mode (and vice versa).
4H, Daily, WeeklyContextual awareness for long-term narrative alignment.

C. ADR Label (On Chart)

Enabled via Show ADR Label on Chart. A floating label displays ADR: X% next to the last candle. Color is green below 100% and red at or above 100%. The label automatically positions itself past all active PO3 candle groups to prevent overlap with key level labels.

2. Logic & Bias

Two settings control how Aurora interprets direction and how strictly it filters signals: Logic Mode and Bias Logic.

Logic Modes

ModeFilter AppliedBest For
Simple Sweep None β€” fires on every valid sweep + iFVG combination. Ranging/choppy days, scalping, learning the model.
Strict Signal must align with the current ERL/IRL Narrative Flow (e.g. shorting only during Bearish Expansion). Standard day trading. Recommended default.
Super Strict Narrative Flow AND 5m–1H intraday trend must both align before a signal fires. High-probability setups, trend-following sessions.

Bias Logic Options

Controls how Aurora determines the current directional bias. Set via Bias Logic in the Strategy & Bias group.

OptionHow It Works
ICT Cycle (ERL/IRL) Tracks the flow between External Range Liquidity (highs/lows) and Internal Range Liquidity (FVGs). The most precise mode. Configurable via Narrative Timeframe (15m / 1H / 4H / Daily) and Pivot Lookback (ERL).
Structure Uses pivot-based Market Structure Shifts (MSS) to determine bias direction. Bullish above last MSS, Bearish below.
Aurora Cloud Uses a 5-EMA ribbon (10 / 20 / 30 / 40 / 50). All EMAs rising = Bullish. All falling = Bearish. Mixed = neutral.
Daily/4H Candle Uses the current Daily and 4H candle close direction as a simple top-down bias proxy.

The ICT Cycle β€” ERL vs IRL

The market moves in a continuous institutional loop. Understanding this is the core of Aurora's signal logic.

  • Expansion (IRL β†’ ERL): Price leaves a Fair Value Gap (Internal Liquidity) and drives toward an external High or Low. Strong, directional conditions. Short setups during Bearish Expansion, Long setups during Bullish Expansion.
  • Retracement (ERL β†’ IRL): Price sweeps an external High or Low and returns toward an internal FVG. Counter-trend or reversal conditions.
Tip: Enable Show Narrative Drawings to visualize ERL lines (dashes at highs/lows) and IRL boxes (FVG zones) directly on your chart.

Aurora Cloud

Enable via Show Aurora Cloud in the Display & Theme group. Five EMAs are plotted as a color-filled ribbon. When all EMAs are rising the cloud fills green (bullish). When all are falling it fills purple (bearish). Colors are fully customizable via the Custom Palette group.

3. Signal Triggers

Each trigger type can be enabled or disabled independently in 03 β€” Signal Triggers. A signal fires when a trigger condition is met and an Inversion FVG immediately confirms the reversal.

Sweep-Based Signals

ToggleWhat Triggers It
PWH/L PDH/L SweepsPrice sweeps a Previous Week High/Low or Previous Day High/Low, then an iFVG forms. On by default
Session SweepsPrice sweeps an Asia, London, NY AM, or NY PM session High/Low, then an iFVG forms. On by default
BSL/SSL SweepsPrice sweeps a local Range High (BSL) or Range Low (SSL) defined by pivot logic, then an iFVG forms. Off by default

Continuation Signals

ToggleWhat Triggers It
HTF 5m/15m (Continuation)Price rejects a 5m or 15m FVG (wicks in, closes out), then an iFVG forms. Best for joining existing trends. On by default
HTF 1H (Continuation)Same model using a 1H FVG zone. On by default
Narrative Int. FVG Touch + iFVGPrice taps the current Internal FVG identified by the ERL/IRL engine, then an iFVG confirms. On by default
POC Touch + iFVGPrice touches the Volume Profile Point of Control, then an iFVG forms. Requires Volume Profile to be active. On by default

HTF Reversal Signal

ToggleWhat Triggers It
HTF (4H/Daily) ReversalPrice mitigates a 4H or Daily FVG, then an iFVG forms. Mitigation Mode can be set to Body or Body/Wick. Off by default

Unicorn Model

Enable via Unicorn Model. Detects when a Breaker Block overlaps with a Standard FVG β€” a high-confluence institutional zone. A purple "Unicorn" box is drawn for entry on retest.

  • Swings β€” controls the lookback for breaker block identification. Default: 2.

Alerts

SettingBehavior
Signal AlertsFires on confirmed Buy/Sell labels (candle close). Default: on.
Early Signal Alerts (Real-Time)Fires immediately when conditions are met, before candle close. Repaint risk β€” signal may disappear if price retraces. Default: off.
Sweep AlertsFires when any level is swept, even without an entry signal yet. Default: off.

4. Filters & Optimization

Configured in 04 β€” Filters & Optimization. These filters reduce noise and raise the quality bar for each signal. Apply them progressively β€” start with defaults, then tighten as you understand your instrument.

Lookbacks

SettingPurposeDefault
Max Bars (Sweep)Maximum bars allowed between the liquidity sweep and the iFVG entry. Increase for slower timeframes.25
iFVG LookbackMax bars for a Standard FVG to invert into an iFVG. Wider = more signals, more noise.15

FVG Quality Filters

SettingPurposeDefault
FVG Size FilterIgnores FVGs smaller than the multiplier Γ— ATR(14). Filters out micro-noise gaps.On, 0.10Γ—
Unicorn FVG Size FilterMinimum size threshold for Unicorn FVG zones (as a ratio of price).On, 0.02
Breakout ConvictionSignal candle close must be X% of the gap size past the level. Prevents weak fakeout entries.Off, 5%

Candle Shape

SettingPurposeDefault
Strong CloseSignal candle must close in the top 60% of its range (for buys) or bottom 60% (for sells). Ensures the candle shows momentum, not indecision.On, 0.6

ADR Filter

The ADR Filter is one of the most impactful quality filters. It blocks signals when the day is either too quiet or already exhausted.

SettingDescriptionDefault
ADR Filter (β‰₯min% & <100%)Only generates signals when the current day's range falls within a healthy ADR window.On
Min ADR%Signals are blocked when the daily move is below this threshold β€” the market is too slow to offer momentum.60%
Max (fixed)Signals are blocked when ADR β‰₯ 100% β€” the day is fully extended and continuation risk is high.100%
Tip: Raise Min ADR% to 70–80% to trade only on active trending days. Disable entirely for crypto or low-ADR instruments.

Confluence Filters

SettingPurposeDefault
SMT FilterRequires divergence between the chart instrument and a correlated ticker (e.g. NQ diverging from ES). Enter the correlation symbol in the Ticker field.Off
SMT Lines / Width / PivotsDraws SMT divergence pivot lines on the chart when the SMT filter fires.Off, 1, 3
Obstacle RR FilterInvalidates a trade if the nearest opposing level (HTF FVG, PDH/L) is closer than the minimum RR ratio β€” ensuring reward space exists before entering.Off, min RR 1.0
Volume FilterSignal volume must exceed the 20-bar average volume.Off

5. Institutional Levels & Sessions

Configured in 05 β€” Institutional Levels. These are the key price levels and session zones Aurora tracks as both signal sources and targets.

Key Levels

Show Key Levels is the master toggle. Extend Bars controls how far lines project to the right (default: 10).

LevelDescription
PDH / PDLPrevious Day High and Low. Prime sweep targets on the open. Line style and width configurable.
PWH / PWLPrevious Week High and Low. Higher-significance liquidity pools. Line style and width configurable.
Range High (BSL)Current buy-side liquidity β€” the pivot high of the active range.
Range Low (SSL)Current sell-side liquidity β€” the pivot low of the active range.
Range 50%Midpoint of Range H and Range L. Automatically updates whenever either extreme changes β€” premium/discount reference.

Session Killzones

Show Killzones toggles background shading behind each trading session. Timezone defaults to America/New_York.

SessionDefault Time (NY)Default
Asia20:00 – 00:00On
London02:00 – 05:00On
NY AM09:30 – 11:00On
NY PM13:30 – 16:00Off

Each session has an independent color picker. Session times are fully editable to match your instrument's active hours.

Session High/Low Lines

  • Session Background β€” shades the full candle range of each session.
  • Session High/Low Lines β€” extends horizontal lines from session extremes forward. Configurable style and width.
  • Session Labels β€” shows the session name on each line.

Midnight Open Levels

LevelDefaultHour (GMT)
UK MidnightOff0 (00:00 GMT)
NY MidnightOn5 (05:00 GMT winter / 04:00 summer)

Colors are set in the Custom Palette group (UK Midnight Color and NY Midnight Color).

6. Price Action & Structure

Configured in 06 β€” Price Action & Structure. Controls how Aurora visualizes market structure and fair value gaps on your chart.

Market Structure

SettingDescriptionDefault
Show MSSMarket Structure Shift β€” drawn when price breaks a swing and reverses direction. The primary structural signal.On
Show BOSBreak of Structure β€” continuation breaks in the current trend direction.Off
MSS ModeBody Only requires a full candle body close past the level. Body/Wick allows wick breaks.Body Only
HTF StructOptional higher timeframe for structure detection (leave blank to use chart timeframe).Chart TF
Swing BarsPivot lookback for structure swing detection.2

Inversion FVGs (iFVGs)

iFVGs are the primary entry confirmation. They form when a Standard FVG is breached and price inverts through it, signaling institutional interest at that zone.

SettingDescriptionDefault
Show all iFVGsDisplay all iFVG boxes β€” not only the ones attached to active signals.Off
ExtendExtend iFVG boxes forward in time until mitigated.On
iFVG LabelsShow "iFVG" text label on each box.On

iFVGs expire automatically after 30 bars if not mitigated.

Standard FVGs

Standard FVGs are three-candle imbalance zones used as support/resistance and as the raw source for iFVG formation.

SettingDescriptionDefault
Show all FVGsDisplay all standard FVG boxes as S/R zones.Off
ExtendNumber of bars to extend FVG boxes.2
FVG LabelsShow "FVG" label on each box.Off

7. HTF Overlays & PO3

Configured in 07 β€” HTF Overlays (PO3). Brings higher timeframe context directly onto your chart so you never lose sight of the bigger picture.

HTF FVGs

Enable via Show HTF FVGs. Overlays Fair Value Gaps from a 4H or Daily timeframe as boxes on your chart.

  • Confirmed (solid boxes) β€” fully-formed gaps from closed HTF candles. Use these for RTC Rejection setups.
  • Unconfirmed "ghost" boxes β€” gaps forming in real time on the current HTF candle. Use to anticipate where price might stall or pivot.

PO3 β€” Power of 3 Candles

Draws up to three groups of HTF candles to the right of the last chart bar. This lets you read the current phase (Accumulation, Manipulation, Distribution) of each HTF candle without switching timeframes.

GroupDefault TFDefault CountDefault
PO3 HTF 11H3 candlesOn
PO3 HTF 24H3 candlesOn
PO3 HTF 3Daily2 candlesOff

How to Read PO3 Candles

  • Wick forming, small body β€” Manipulation phase. Price is engineering liquidity above or below. Wait for the sweep to complete before entering.
  • Body forming cleanly in one direction β€” Distribution/Expansion. The institutional move is underway. Align with it.
  • Doji / no direction β€” Accumulation phase. Market is building a position. Stay patient.
Tip: When the 4H PO3 candle body is expanding bearish, avoid taking Long signals β€” you're fighting the HTF expansion. Wait for the 4H candle to complete before looking for counter-trend setups.

8. Time Filter

Configured in 08 β€” Time Filter. When enabled, signals only fire within the defined time windows β€” keeping you out of choppy off-hours markets.

Enable Time Filter β€” master toggle. Default: Off

Silver Bullet Mode

Uses the three ICT Silver Bullet windows β€” the highest-probability sessions within each trading day. All times are in New York timezone (configurable).

WindowDefault Time
SB London03:00 – 04:00 AM
SB NY AM10:00 – 11:00 AM
SB NY PM14:00 – 15:00 PM

Each window is individually editable. Disable any window by removing it from your active sessions.

Custom Window Mode

Define a single custom session string (default: 0930-1600) to restrict signals to your preferred trading hours.

9. Backtest Panel

Configured in 09 β€” Backtest Panel. The built-in backtester evaluates all historical signals with your chosen SL/TP logic and displays a performance summary.

Enable via Show Backtest Table. Default: Off

Stop Loss Modes

ModeHow It Works
Manipulation Candle (Swing) Uses the highest high / lowest low of the sweep candle range. The most conservative and structurally logical placement. Default
Fractal Pivot Uses the most recent N-bar swing high/low as the stop. Fractal Lookback default: 5 bars.
Signal Candle Stop at the high/low of the signal candle itself. Tight and aggressive.
ATR Volatility Stop = Entry Β± (ATR Γ— multiplier). ATR Length: 14. ATR Multiplier: 1.5. Adapts to current volatility.
Structural (Breaker/FVG) Uses the invalidation level of the specific entry pattern β€” e.g. the outer edge of the iFVG or breaker block.

Take Profit Logic

ModeHow It Works
Fixed RRTP = Entry Β± (SL distance Γ— RR ratio). Default RR: 2.0. Simple and consistent.
Next Liquidity LevelTP targets the nearest opposing PDH/L, Session H/L, or HTF FVG. Adapts to market structure.

Breakeven

  • Move to Breakeven β€” when enabled, the stop moves to entry once price reaches the breakeven trigger. Default: Off
  • Breakeven Trigger (RR) β€” the R-multiple at which BE activates. Default: 1.0R.

Visual Tools

  • Show Entry/TP/SL β€” draws TP and SL lines on each signal for visual review on the chart.
  • Show Win/Loss/Be β€” draws W / L / BE labels above or below each completed signal candle.

Backtest Metrics

MetricDescription
Win RatePercentage of closed signals that hit the take profit target.
Net Return (R)Total risk units gained across all historical signals.
Win / Loss StreaksMaximum consecutive wins and losses β€” useful for sizing expectations.
Note: Backtester results reflect historical signal data with the currently active filters. Change your filter settings (ADR, Strong Close, Logic Mode, etc.) to see how they affect performance across the same history.

10. Volume Profile

Configured in 10 β€” Volume Profile. Aurora includes a built-in session-based volume profile with a Point of Control (POC) signal trigger.

Display Mode

OptionWhat It Shows
NothingVolume profile hidden entirely.
POC OnlyOnly the Point of Control line is drawn β€” the price level with the highest traded volume. Default
BothPOC line plus the full Value Area (VA High / VA Low bars) with volume distribution histogram.

Profile Settings

SettingDescriptionDefault
Lookback BarsNumber of bars included in the volume distribution calculation. More bars = broader context.150
Row SizeNumber of horizontal price bins for the profile histogram.24
Value Area %The percentage of total volume that defines the Value Area (VA High to VA Low).70%
POC Color / WidthAppearance of the Point of Control line.Red, width 2
VA Bull / BearColors for Value Area High and Low zones.Blue / Pink
Vol Bull / BearColors for individual volume bars within the histogram.Lighter Blue / Pink
Tip: The POC Touch + iFVG signal trigger uses this POC level as a confluence zone. When price touches the POC and an iFVG immediately forms, Aurora generates a signal. Enable POC Only or Both mode to see the level on your chart.

11. Full Settings Reference

Complete dictionary of every input in the indicator menu, organized by group.

01 β€” Display & Theme

Overall Font SizeMaster text size for all labels, tables, and boxes. Options: Tiny / Small / Normal / Large / Huge.
Color ThemeAurora Dark / Aurora Dark 2 / Professional Light / Aurora Light / Custom.
Show Bias DashboardTop-right cycle and narrative panel.
Show Liquidity Pools on DashboardAdds swept-level tracking rows to the dashboard.
Show MTF Trend TableBottom-right multi-timeframe structure table.
Show ADR Label on ChartFloating ADR% label next to last candle, auto-positioned past PO3 groups.
Struct Pivot Left / RightPivot lookback for the MTF Structure table rows.
Show Aurora Cloud5-EMA colored cloud overlay (EMAs 10/20/30/40/50).
Vol on LabelAppends volume reading to signal Buy/Sell labels.
Sweep S LabelsShows "S" markers on sweep candles.
Sweep Name LabelsShows the swept level's name alongside the "S" marker.
Sweep Signal BoxesDraws the iFVG box on confirmed signals.
Level LabelsShows name labels on all key level lines (Range H, PDH, etc.).

Custom Palette (active only when Theme = Custom)

Bull Color, Bear Color, Text Color, Neutral Color, Sweep Color, Bullish/Bearish FVG Color, Bullish/Bearish iFVG Color, UK Midnight Color, NY Midnight Color, Aurora Cloud Bull/Bear Color.

02 β€” Strategy & Bias

Show SignalsMaster toggle for all Buy/Sell labels.
Show Entry/TP/SLDraws TP and SL lines on each signal.
Show Win/Loss/BeDraws outcome labels above/below each completed signal candle.
Logic ModeSimple Sweep / Strict / Super Strict.
Bias LogicICT Cycle (ERL/IRL) / Structure / Aurora Cloud / Daily/4H Candle.
Narrative TimeframeHTF for ERL/IRL engine: 15m / 1H / 4H / Daily.
Pivot Lookback (ERL)Swing lookback for External Range Liquidity detection. Default: 2.
Show Narrative DrawingsDraws ERL lines (highs/lows) and IRL FVG boxes on the chart.
Style / SizeLine style and width for narrative drawings.

03 β€” Signal Triggers

PWH/L PDH/L SweepsSweep signals on previous day/week highs and lows.
Session SweepsSweep signals on session (Asia/London/NY) highs and lows.
BSL/SSL SweepsSweep signals on local range highs/lows. Off by default.
HTF 5m/15m (Continuation)Rejection of 5m or 15m FVG with iFVG confirmation.
HTF 1H (Continuation)Rejection of 1H FVG with iFVG confirmation.
Narrative Int. FVG Touch + iFVGTouch of the ERL/IRL internal FVG zone.
POC Touch + iFVGTouch of Volume Profile Point of Control.
HTF (4H/Daily) ReversalMitigation of 4H or Daily FVG. Off by default.
Mitigation ModeBody / Body+Wick for HTF FVG mitigation detection.
Unicorn ModelBreaker Block + FVG overlap pattern.
SwingsLookback for Unicorn breaker detection. Default: 2.
Signal AlertsAlert on confirmed signals at candle close.
Early Signal AlertsReal-time alert (repaint risk). Default: off.
Sweep AlertsAlert on any sweep event, before signal confirmation.

04 β€” Filters & Optimization

Max Bars (Sweep)Max bars between sweep and iFVG entry. Default: 25.
iFVG LookbackMax bars for a gap to invert. Default: 15.
FVG Size FilterFilters tiny FVGs below ATR multiplier threshold. Default: on, 0.10Γ—.
Unicorn FVG Size FilterMin size for Unicorn FVGs. Default: on, 0.02.
Breakout ConvictionClose must break X% past level. Default: off, 5%.
Strong CloseClose must be in top/bottom 60% of candle range. Default: on.
Volume FilterVolume must exceed 20-bar average. Default: off.
SMT FilterRequires divergence with correlated ticker. Default: off.
SMT Lines / Width / PivotsVisual settings for SMT divergence lines.
Obstacle RR FilterBlocks trade if opposing level is too close. Default: off, min RR 1.0.
ADR FilterOnly signal within healthy ADR window. Default: on.
Min ADR%Minimum daily range activity required to signal. Default: 60%.

05 β€” Institutional Levels

Show Key LevelsMaster toggle for all key level lines.
Extend BarsHow far level lines project to the right. Default: 10.
PDH/LPrevious Day High/Low. Style and width configurable.
PWH/LPrevious Week High/Low. Style and width configurable.
Show KillzonesSession background shading. Timezone configurable.
Asia / London / NY AM / NY PMIndividual session toggles, time ranges, and background colors.
Session BackgroundFull candle range background shading per session.
Session High/Low LinesHorizontal lines extending from session extremes.
Session LabelsName labels on session lines.
UK Midnight LevelUK midnight open line. Default: off, 00:00 GMT.
NY Midnight LevelNY midnight open line. Default: on, 05:00 GMT.

06 β€” Price Action & Structure

Show MSSMarket Structure Shift lines. Default: on.
Show BOSBreak of Structure lines. Default: off.
MSS ModeBody Only / Body+Wick.
HTF StructOptional HTF for structure detection.
Swing BarsPivot bars for structure. Default: 2.
Show all iFVGsDisplay all iFVG boxes. Default: off.
Extend (iFVG)Extend iFVG boxes forward. Default: on.
iFVG LabelsLabel iFVG boxes. Default: on.
Show all FVGsDisplay all standard FVG boxes. Default: off.
Extend (FVG)FVG box extension bars. Default: 2.
FVG LabelsLabel FVG boxes. Default: off.

07 β€” HTF Overlays (PO3)

Show HTF FVGsOverlay HTF FVG boxes. Default: off.
HTF FVGs Timeframe4H or Daily.
Show PO3 HTF 1First PO3 candle group. Default: on, 1H, 3 candles.
Show PO3 HTF 2Second PO3 candle group. Default: on, 4H, 3 candles.
Show PO3 HTF 3Third PO3 candle group. Default: off, Daily, 2 candles.

08 β€” Time Filter

Enable Time FilterMaster toggle. Default: off.
ModeSilver Bullet (3 preset windows) or Custom Window.
SB LondonSilver Bullet London window. Default: 03:00–04:00 AM NY.
SB NY AMSilver Bullet NY AM window. Default: 10:00–11:00 AM NY.
SB NY PMSilver Bullet NY PM window. Default: 14:00–15:00 PM NY.
Custom SessionUser-defined session string. Default: 09:30–16:00.
TimezoneTimezone for time filter. Default: America/New_York.

09 β€” Backtest Panel

Show Backtest TableDisplay performance table. Default: off.
Stop Loss ModeManipulation Candle / Fractal Pivot / Signal Candle / ATR Volatility / Structural.
Take Profit LogicFixed RR or Next Liquidity Level.
ATR LengthFor ATR SL mode. Default: 14.
ATR MultiplierFor ATR SL mode. Default: 1.5.
Fractal LookbackFor Fractal Pivot mode. Default: 5 bars.
Fixed Risk:Reward (TP)TP multiplier. Default: 2.0.
Move to BreakevenShift SL to entry after X R. Default: off.
Breakeven Trigger (RR)R-multiple that triggers BE. Default: 1.0.

10 β€” Volume Profile

ShowNothing / POC Only / Both. Default: POC Only.
Lookback BarsBars in profile calculation. Default: 150.
Row SizeHistogram bins. Default: 24.
Value Area %Volume % that defines the Value Area. Default: 70%.
POC Color / WidthPoint of Control line style. Default: red, width 2.
VA Bull / BearValue Area High/Low zone colors.
Vol Bull / BearVolume bar colors within the histogram.