Index: trunk/ppStack/src/ppStackPSF.c
===================================================================
--- trunk/ppStack/src/ppStackPSF.c	(revision 30620)
+++ trunk/ppStack/src/ppStackPSF.c	(revision 34091)
@@ -4,8 +4,10 @@
 
 pmPSF *ppStackPSF(const pmConfig *config, int numCols, int numRows,
-                  const psArray *psfs, const psVector *inputMask)
+                  const psArray *psfs, ppStackOptions *options)
 {
     bool mdok = false;
     pmPSF *psf = NULL;
+
+    const psVector *inputMask = options->inputMask;
 
     // Get the recipe values
@@ -55,4 +57,20 @@
 	}
 
+	//MEH -- preliminary add option -1 for choosing mean FWHM of inputs. Nsig<0 for scaling +Nsig by mean
+	if (psfFWHM<0.0){
+	    float NpsfFWHMsig = psMetadataLookupF32(&mdok, recipe, "PSF.OUTPUT.NFWHMSIG"); // Nsig to include
+	    if (!mdok){
+	    	NpsfFWHMsig = 0.0;
+	    }
+	    float clippedMean = options->clippedMean;
+	    float clippedStdev = options->clippedStdev;
+	    psfFWHM = clippedMean + NpsfFWHMsig*clippedStdev;
+	    if (NpsfFWHMsig<0.0){
+	    	psfFWHM = clippedMean + NpsfFWHMsig * -1.0*clippedStdev/clippedMean;
+	    }
+	}
+
+
+
 	float Mxx = M_SQRT2 * psfFWHM / 2.35;