Index: trunk/Ohana/src/opihi/dvo/mextract.c
===================================================================
--- trunk/Ohana/src/opihi/dvo/mextract.c	(revision 28241)
+++ trunk/Ohana/src/opihi/dvo/mextract.c	(revision 28955)
@@ -88,8 +88,9 @@
   mosaicMode = FALSE;
   for (i = 0; !loadImages && (i < Nfields); i++) {
-    if (fields[i].ID == MEAS_XCCD) loadImages = TRUE;
-    if (fields[i].ID == MEAS_YCCD) loadImages = TRUE;
+    if (fields[i].ID == MEAS_XCCD) loadImages = TRUE;   // Are these still needed? Xccd and Yccd are in measurement
+    if (fields[i].ID == MEAS_YCCD) loadImages = TRUE;   // and dbExtractMeasures doesn't look at the image for these
     if (fields[i].ID == MEAS_XMOSAIC) loadImages = mosaicMode = TRUE;
     if (fields[i].ID == MEAS_YMOSAIC) loadImages = mosaicMode = TRUE;
+    if (fields[i].ID == MEAS_EXTERN_ID) loadImages = mosaicMode = TRUE;
   }
   if (loadImages && !SetImageSelection (mosaicMode, selection)) goto escape;
@@ -305,4 +306,5 @@
     gprint (GP_ERR, "  catID : catalog ID (32 bit)\n");
     gprint (GP_ERR, "  imageID : ID of source image (32 bit)\n");
+    gprint (GP_ERR, "  externID : externID of source image (32 bit)\n");
     return (FALSE);
   }