diff --git a/Packages/MIES/MIES_SweepFormula_PSX.ipf b/Packages/MIES/MIES_SweepFormula_PSX.ipf
index 943afcbb92..bcd49b0281 100644
--- a/Packages/MIES/MIES_SweepFormula_PSX.ipf
+++ b/Packages/MIES/MIES_SweepFormula_PSX.ipf
@@ -591,7 +591,7 @@ static Function [variable baseline_t, variable baseline] PSX_CalculateEventBasel
 
 	variable range
 
-	WaveStats/M=1/Q/R=(peak_t - 4 * kernelRiseTau, peak_t) sweepDataOffFilt
+	WaveStats/M=1/Q/R=(peak_t - 10 * kernelRiseTau, peak_t) sweepDataOffFilt
 
 	if(kernelAmp > 0)
 		baseline_t = V_minloc
@@ -692,12 +692,12 @@ static Function [WAVE/D peakX, WAVE/D peakY] PSX_AnalyzePeaks(WAVE sweepDataOffF
 
 	return [peakX, peakY]
 End
-
-static Function PSX_GetGoodTauFallback(WAVE tau)
-
-	WaveStats/Q tau
-	return V_avg + 2 * V_sdev
-End
+//
+//static Function PSX_GetGoodTauFallback(WAVE tau)
+//
+//	WaveStats/Q tau
+//	return V_avg + 2 * V_sdev
+//End
 
 static Function PSX_GetGoodTau(WAVE psxEvent)
 
@@ -728,43 +728,47 @@ static Function PSX_GetGoodTauImpl(WAVE psxEvent)
 	if(!WaveExists(tau))
 		return NaN
 	endif
+	
+	WaveStats/Q tau
+	
+	return V_avg + 2.5 * V_sdev
 
-	numEvents = DimSize(tau, ROWS)
-
-	if(numEvents <= 10)
-		return PSX_GetGoodTauFallback(tau)
-	endif
-
-	Make/FREE/D/N=0 hist
-	Histogram/B=5/DP/DEST=hist tau; err = GetRTError(1)
-
-	if(err)
-		return PSX_GetGoodTauFallback(tau)
-	endif
-
-	// Gaussian peak: y = K0+K1*exp(-((x-K2)/K3)^2)
-	// with:
-	// K0 = y0
-	// K1 = A
-	// K2 = x0
-	// K3 = \sqrt{2} * sigma
-	[WAVE coefWave, WAVE fitWave] = PSX_FitHistogram(hist)
-
-	//	Duplicate/O fitWave, root:fitwave
-
-	if(!WaveExists(coefWave))
-		return PSX_GetGoodTauFallback(tau)
-	endif
-
-	// XXXX sigma away from the center
-	xVal = coefWave[2] + 2.5 * (coefWave[3] / sqrt(2))
-	return xval // Gauss1D(coefWave, xVal)
+//	numEvents = DimSize(tau, ROWS)
+//
+//	if(numEvents <= 10)
+//		return PSX_GetGoodTauFallback(tau)
+//	endif
+//
+//	Make/FREE/D/N=0 hist
+//	Histogram/B=5/DP/DEST=hist tau; err = GetRTError(1)
+//
+//	if(err)
+//		return PSX_GetGoodTauFallback(tau)
+//	endif
+//
+//	// Gaussian peak: y = K0+K1*exp(-((x-K2)/K3)^2)
+//	// with:
+//	// K0 = y0
+//	// K1 = A
+//	// K2 = x0
+//	// K3 = \sqrt{2} * sigma
+//	[WAVE coefWave, WAVE fitWave] = PSX_FitHistogram(hist)
+//
+//	//	Duplicate/O fitWave, root:fitwave
+//
+//	if(!WaveExists(coefWave))
+//		return PSX_GetGoodTauFallback(tau)
+//	endif
+//
+//	// XXXX sigma away from the center
+//	xVal = coefWave[2] + 2.5 * (coefWave[3] / sqrt(2))
+//	return xval // Gauss1D(coefWave, xVal)
 End
 
 /// @brief Return the x-axis range useful for displaying and extracting a single event
 static Function [variable first, variable last] PSX_GetSingleEventRange(WAVE psxEvent, WAVE sweepDataOffFilt, variable index)
 
-	variable numEvents, offset
+	variable numEvents, offset, onset, baseline
 
 	numEvents = DimSize(psxEvent, ROWS)
 
@@ -776,7 +780,14 @@ static Function [variable first, variable last] PSX_GetSingleEventRange(WAVE psx
 		offset = PSX_DEFAULT_X_START_OFFSET
 	endif
 
-	first = psxEvent[index][%baseline_t] // - 0.5
+	onset = psxEvent[index][%$"Onset Time"]
+	baseline = psxEvent[index][%baseline_t]
+
+	if(!IsNaN(onset))
+		first = min(onset, baseline)
+	else
+		first = baseline
+	endif
 
 	if(index == numEvents - 1)
 		last = min(first + offset, IndexToScale(sweepDataOffFilt, DimSize(sweepDataOffFilt, ROWS) - 1, ROWS))
@@ -2255,7 +2266,7 @@ static Function PSX_UpdateAverageTraces(string win, WAVE/T eventIndexFromTraces,
 				fitStartAbs = psxEvent[idx][%$"Onset Time"]
 
 				if(IsFinite(fitStartAbs))
-					ASSERT(fitStartAbs > extractStartAbs, "Unexpected fit/extraction start positions")
+					ASSERT(fitStartAbs >= extractStartAbs, "Unexpected fit/extraction start positions")
 
 					eventStartTime[acceptIndex] = fitStartAbs - extractStartAbs
 					eventStopTime[acceptIndex]  = extractStopAbs - extractStartAbs
diff --git a/Packages/MIES/MIES_WaveDataFolderGetters.ipf b/Packages/MIES/MIES_WaveDataFolderGetters.ipf
index c1c182c427..24aa398c09 100644
--- a/Packages/MIES/MIES_WaveDataFolderGetters.ipf
+++ b/Packages/MIES/MIES_WaveDataFolderGetters.ipf
@@ -8232,7 +8232,7 @@ End
 ///            in the filtered sweep wave
 /// -  4/peak_t: peak time
 /// -  5/baseline: Maximum (negative kernel amp sign) or minimum (positive kernel amp sign) in the range of
-///                    [peak_t – 4 * kernelRiseTau, peak_t], averaged over +/- 5 points, in the filtered sweep wave
+///                    [peak_t – 10 * kernelRiseTau, peak_t], averaged over +/- 5 points, in the filtered sweep wave
 /// -  6/baseline_t: baseline time
 /// -  7/amplitude: Relative amplitude: [3] - [5]
 /// -  8/iei: Time difference to previous event (inter event interval) [ms]