Index: trunk/ppSub/src/ppSubMatchPSFs.c
===================================================================
--- trunk/ppSub/src/ppSubMatchPSFs.c	(revision 23217)
+++ trunk/ppSub/src/ppSubMatchPSFs.c	(revision 23235)
@@ -50,9 +50,30 @@
 
     // Sources in image, used for stamps: these must be loaded from previous analysis stages
-    pmReadout *sourcesRO = pmFPAfileThisReadout(config->files, view, "PPSUB.SOURCES"); // Readout with sources
-    psArray *sources = NULL;            // Sources in image; used for stamps
-    if (sourcesRO) {
-        sources = psMetadataLookupPtr(&mdok, sourcesRO->analysis, "PSPHOT.SOURCES");
+    psArray *inSources = psMetadataLookupPtr(&mdok, inRO->analysis, "PSPHOT.SOURCES"); // Input source list
+    psArray *refSources = psMetadataLookupPtr(&mdok, refRO->analysis, "PSPHOT.SOURCES"); // Ref source list
+
+    psArray *sources = NULL;            // Merged list of sources
+    if (inSources && refSources) {
+        float radius = psMetadataLookupF32(NULL, recipe, "SOURCE.RADIUS"); // Matching radius
+        psArray *lists = psArrayAlloc(2); // Source lists
+        lists->data[0] = psMemIncrRefCounter(inSources);
+        lists->data[1] = psMemIncrRefCounter(refSources);
+        sources = pmSourceMatchMerge(lists, radius);
+        psFree(lists);
+        if (!sources) {
+            psError(PS_ERR_UNKNOWN, false, "Unable to merge source lists");
+            return false;
+        }
+    } else if (inSources) {
+        sources = psMemIncrRefCounter(inSources);
+    } else if (refSources) {
+        sources = psMemIncrRefCounter(refSources);
     }
+
+    psMetadataAddArray(inConv->analysis, PS_LIST_TAIL, "PSPHOT.SOURCES", PS_META_REPLACE,
+                       "Merged source list", sources);
+    psMetadataAddArray(refConv->analysis, PS_LIST_TAIL, "PSPHOT.SOURCES", PS_META_REPLACE,
+                       "Merged source list", sources);
+    psFree(sources);                    // Drop reference
 
     int footprint = psMetadataLookupS32(NULL, recipe, "STAMP.FOOTPRINT"); // Stamp half-size