Index: trunk/Ohana/src/addstar/src/mkcmf.c
===================================================================
--- trunk/Ohana/src/addstar/src/mkcmf.c	(revision 39076)
+++ trunk/Ohana/src/addstar/src/mkcmf.c	(revision 39077)
@@ -446,4 +446,5 @@
     gfits_modify (&header, "HIERARCH FPA.ZP", "%f", 1, 25.0);
   }
+
   if (isDiff) {
     gfits_modify (&header, "HIERARCH FPA.ZP",  "%f", 1, zeroPt);
@@ -451,8 +452,16 @@
     gfits_modify (&header, "HIERARCH PPSUB.REFERENCE", "%s", 1, "RINGS.V3.skycell.2289.079.stk.4063469.unconv.fits");
     gfits_modify (&header, "PHOT_V",              "%s", 1, "38100");
+
+    // keywords related to convolution & diff image process:
+    gfits_modify (&header, "HIERARCH SUBTRACTION.STAMPS",  "%d", 1, 210);
+    gfits_modify (&header, "HIERARCH SUBTRACTION.DEV.MEAN",  "%f", 1, 0.01);
+    gfits_modify (&header, "HIERARCH SUBTRACTION.DEV.RMS",  "%f", 1, 0.02);
+    gfits_modify (&header, "HIERARCH SUBTRACTION.NORM",  "%f", 1, 0.05);
+    gfits_modify (&header, "HIERARCH SUBTRACTION.CONV.MAX",  "%f", 1, 1.5);
+    gfits_modify (&header, "HIERARCH SUBTRACTION.DECONV.MAX",  "%f", 1, 0.1);
+
     // CZW There are other fields, but they don't appear to be used by ipp2psps.
   }
 
-  
   int i;
   for (i = 1; i < 32; i++) {