Index: /trunk/psphot/src/psphotMergeSources.c
===================================================================
--- /trunk/psphot/src/psphotMergeSources.c	(revision 11183)
+++ /trunk/psphot/src/psphotMergeSources.c	(revision 11183)
@@ -0,0 +1,11 @@
+# include "psphot.h"
+
+// add newly selected sources to the existing list of sources
+bool psphotMergeSources (psArray *oldSources, psArray *newSources) {
+
+    for (int i = 0; i < newSources->n; i++) {
+	pmSource *source = newSources->data[i];
+	psArrayAdd (oldSources, 100, source);
+    }
+    return true;
+}