Index: /trunk/Ohana/src/relastro/src/ImageOps.c
===================================================================
--- /trunk/Ohana/src/relastro/src/ImageOps.c	(revision 17149)
+++ /trunk/Ohana/src/relastro/src/ImageOps.c	(revision 17150)
@@ -256,5 +256,6 @@
 
 // return StarData values for detections in the specified image, converting coordinates from the
-// chip positions: X,Y -> L,M -> P,Q -> R,D
+// chip positions: X,Y -> L,M -> P,Q -> R,D.  This function is used by the image fitting steps, for
+// which the detections have already been filtered when they were loaded (bcatalog)
 StarData *getImageRaw (Catalog *catalog, int Ncatalog, int im, int *Nstars, CoordMode mode) {
 
@@ -292,4 +293,5 @@
     n = catalog[c].measure[m].averef;
 
+    // an object with only one detection provides no information about the image calibration
     raw[i].mask = FALSE;
     if (catalog[c].average[n].Nmeasure < 2) {
@@ -322,4 +324,5 @@
 // return StarData values for averages positions in the specified image, converting coordinates from
 // the sky positions: R,D -> P,Q -> L,M -> X,Y
+
 StarData *getImageRef (Catalog *catalog, int Ncatalog, int im, int *Nstars, CoordMode mode) {