Index: trunk/psModules/src/imcombine/pmPSFEnvelope.c
===================================================================
--- trunk/psModules/src/imcombine/pmPSFEnvelope.c	(revision 25487)
+++ trunk/psModules/src/imcombine/pmPSFEnvelope.c	(revision 25488)
@@ -370,4 +370,29 @@
     psFree(try);
 
+    if (psTraceGetLevel("psModules.imcombine") >= 1) {
+        psString string = NULL;     // String with values
+        psStringAppend(&string, "Envelope PSF: ");
+        float x = numCols / 2.0, y = numRows / 2.0; // Coordinates of interest
+        for (int j = 4; j < psf->params->n; j++) {
+            pmTrend2D *trend = psf->params->data[j]; // Trend of interest
+            double val = pmTrend2DEval(trend, x, y);
+            double err;
+            switch (trend->mode) {
+              case PM_TREND_POLY_ORD:
+              case PM_TREND_POLY_CHEB:
+                err = NAN;
+                break;
+              case PM_TREND_MAP:
+                err = psImageUnbinPixel(x, y, trend->map->error, trend->map->binning);
+                break;
+              default:
+                psAbort("Unsupported mode: %x", trend->mode);
+            }
+            psStringAppend(&string, "%lf %lf   ", val, err);
+        }
+        psTrace("psModules.imcombine", 1, "%s\n", string);
+        psFree(string);
+    }
+
 #ifdef TESTING
     {