Index: trunk/ppSim/src/ppSimSequenceObject.c
===================================================================
--- trunk/ppSim/src/ppSimSequenceObject.c	(revision 27967)
+++ trunk/ppSim/src/ppSimSequenceObject.c	(revision 42385)
@@ -1,5 +1,5 @@
 # include "ppSimSequence.h"
 
-bool ppSimSequenceObject (FILE *simfile, FILE *inject, psMetadata *sequence, int nSeq, psRandom *rng, const char *path, const char *basename, const char *ppSimCommand, const char *injectCommand, psArray *files) {
+bool ppSimSequenceObject (FILE *simfile, FILE *inject, psMetadata *sequence, int nSeq, psRandom *rng, const char *path, const char *basename, const char *refcat, const char *ppSimCommand, const char *injectCommand, psArray *files) {
 
     bool status;
@@ -97,4 +97,6 @@
 			    psStringAppend (&command, " -obs_mode OBJECT.%s", (char *) filters->data[i]);
 
+			    if (refcat) { psStringAppend (&command, " -D PSASTRO:PSASTRO.CATDIR %s", refcat); }
+
 			    double frnd = psRandomUniform(rng);
 			    float seeing = IQmin + (IQmax - IQmin)*frnd;