Index: /trunk/psModules/src/detrend/pmBias.c
===================================================================
--- /trunk/psModules/src/detrend/pmBias.c	(revision 13773)
+++ /trunk/psModules/src/detrend/pmBias.c	(revision 13774)
@@ -280,4 +280,8 @@
             psMetadataAddStr(hdu->header, PS_LIST_TAIL, "HISTORY", PS_META_DUPLICATE_OK, comment, "");
             psFree(comment);
+
+	    // write metadata header value
+            psMetadataAddF32(hdu->header, PS_LIST_TAIL, "OVER_VAL", PS_META_REPLACE, "Overscan value", reduced);
+            psMetadataAddF32(hdu->header, PS_LIST_TAIL, "OVER_SIG", PS_META_REPLACE, "Overscan stdev", NAN);
 
             (void)psBinaryOp(image, image, "-", psScalarAlloc((float)reduced, PS_TYPE_F32));
@@ -392,4 +396,8 @@
                     psMetadataAddStr(hdu->header, PS_LIST_TAIL, "HISTORY", PS_META_DUPLICATE_OK, comment, "");
                     psFree(comment);
+
+		    // write metadata header value
+		    psMetadataAddF32(hdu->header, PS_LIST_TAIL, "OVER_VAL", PS_META_REPLACE, "Overscan value", poly->coeff[0]);
+		    psMetadataAddF32(hdu->header, PS_LIST_TAIL, "OVER_SIG", PS_META_REPLACE, "Overscan stdev", poly->coeffErr[0]);
                     break;
                 }
@@ -406,4 +414,7 @@
                         psFree(comment);
                     }
+		    // write metadata header value
+		    psMetadataAddF32(hdu->header, PS_LIST_TAIL, "OVER_VAL", PS_META_REPLACE, "Overscan value", NAN);
+		    psMetadataAddF32(hdu->header, PS_LIST_TAIL, "OVER_SIG", PS_META_REPLACE, "Overscan stdev", NAN);
                     break;
                 }