Index: trunk/stac/src/combine.c
===================================================================
--- trunk/stac/src/combine.c	(revision 5743)
+++ trunk/stac/src/combine.c	(revision 6330)
@@ -57,5 +57,5 @@
     stacCombine(&combined, &rejected, images, errors, config->nReject, NULL, saturated, bad, config->reject);
 
-    psFits *outFile = psFitsOpen(config->outName, "r");
+    psFits *outFile = psFitsOpen(config->outName, "w");
     if (!psFitsWriteImage(outFile, headers->data[0], combined, 0)) {
         psErrorStackPrint(stderr, "Unable to write image: %s\n", config->outName);