Index: /branches/eam_branches/ipp-20111122/psphot/src/psphotFitSourcesLinear.c
===================================================================
--- /branches/eam_branches/ipp-20111122/psphot/src/psphotFitSourcesLinear.c	(revision 33069)
+++ /branches/eam_branches/ipp-20111122/psphot/src/psphotFitSourcesLinear.c	(revision 33070)
@@ -99,9 +99,30 @@
     if (psRegionIsNaN (AnalysisRegion)) psAbort("analysis region mis-defined");
 
-    bool CONSTANT_PHOTOMETRIC_WEIGHTS =
-        psMetadataLookupBool(&status, recipe, "CONSTANT_PHOTOMETRIC_WEIGHTS");
+    pmSourceFitVarMode fitVarMode = PM_SOURCE_PHOTFIT_CONST;
+    char *fitVarModeString = psMetadataLookupStr(&status, recipe, "LINEAR_FIT_VARIANCE_MODE");
     if (!status) {
-        psAbort("You must provide a value for the BOOL recipe CONSTANT_PHOTOMETRIC_WEIGHTS");
-    }
+	bool CONSTANT_PHOTOMETRIC_WEIGHTS = psMetadataLookupBool(&status, recipe, "CONSTANT_PHOTOMETRIC_WEIGHTS");
+	if (!status) {
+	    psAbort("You must provide a value for LINEAR_FIT_VARIANCE_MODE or CONSTANT_PHOTOMETRIC_WEIGHTS");
+	}
+	fitVarMode = CONSTANT_PHOTOMETRIC_WEIGHTS ? PM_SOURCE_PHOTFIT_CONST : PM_SOURCE_PHOTFIT_IMAGE_VAR;
+    } else {
+	if (!strcasecmp(fitVarModeString, "CONSTANT") || !strcasecmp(fitVarModeString, "CONST")) {
+	    fitVarMode = PM_SOURCE_PHOTFIT_CONST;
+	    goto gotit;
+	}
+	if (!strcasecmp(fitVarModeString, "IMAGE") || !strcasecmp(fitVarModeString, "IMAGE_VAR")) {
+	    fitVarMode = PM_SOURCE_PHOTFIT_IMAGE_VAR;
+	    goto gotit;
+	}
+	if (!strcasecmp(fitVarModeString, "MODEL") || !strcasecmp(fitVarModeString, "MODEL_VAR")) {
+	    fitVarMode = PM_SOURCE_PHOTFIT_MODEL_VAR;
+	    goto gotit;
+	}
+	psError (PSPHOT_ERR_CONFIG, false, "Invalid value for LINEAR_FIT_VARIANCE_MODE (%s)", fitVarModeString);
+	return false;
+    }
+
+gotit:
     int SKY_FIT_ORDER = psMetadataLookupS32(&status, recipe, "SKY_FIT_ORDER");
     if (!status) {