Index: trunk/ppMerge/src/ppMergeLoop.c
===================================================================
--- trunk/ppMerge/src/ppMergeLoop.c	(revision 23410)
+++ trunk/ppMerge/src/ppMergeLoop.c	(revision 23463)
@@ -118,4 +118,5 @@
       case PPMERGE_TYPE_BIAS:
       case PPMERGE_TYPE_DARK:
+      case PPMERGE_TYPE_CTEMASK:
         break;
       default:
@@ -208,4 +209,5 @@
             // call the init functions
             switch (type) {
+              case PPMERGE_TYPE_CTEMASK:
               case PPMERGE_TYPE_BIAS:
               case PPMERGE_TYPE_FLAT:
@@ -252,4 +254,5 @@
                 // Start a job
                 switch (type) {
+                  case PPMERGE_TYPE_CTEMASK:
                   case PPMERGE_TYPE_BIAS:
                   case PPMERGE_TYPE_FLAT:
@@ -408,4 +411,28 @@
             }
 
+	    // calculate CTEMASK after stats so stats reflect median image
+            if (type == PPMERGE_TYPE_CTEMASK && outRO) {
+		// need to apply range cuts on the output image
+		psAssert (outRO->mask, "mask is not defined");
+		psAssert (outRO->mask->numCols == outRO->image->numCols, "mismatch between image and mask");
+		psAssert (outRO->mask->numRows == outRO->image->numRows, "mismatch between image and mask");
+
+		// CTEMASK parameters
+		float cteMin = psMetadataLookupF32(NULL, arguments, "CTE.MIN"); // Number of fringe points
+
+		char *cteMaskName = psMetadataLookupStr (&mdok, config->arguments, "MASK.SET.VALUE");
+		psImageMaskType cteMaskValue = pmConfigMaskGet(cteMaskName, config);
+
+		psF32 **outputImage = outRO->image->data.F32; 
+		psImageMaskType **outputMask = outRO->mask->data.PS_TYPE_IMAGE_MASK_DATA; 
+		for (int iy = 0; iy < outRO->image->numRows; iy++) {
+		    for (int ix = 0; ix < outRO->image->numCols; ix++) {
+			if (outputImage[iy][ix] < cteMin) {
+			    outputMask[iy][ix] |= cteMaskValue;
+			}
+		    }
+		}
+            }
+
             psFree(outRO);
             cellNum++;