Index: trunk/ppSim/src/ppSimMakeBias.c
===================================================================
--- trunk/ppSim/src/ppSimMakeBias.c	(revision 14463)
+++ trunk/ppSim/src/ppSimMakeBias.c	(revision 14657)
@@ -1,7 +1,9 @@
 # include "ppSim.h"
 
-psVector *ppSimMakeBias (psImage *signal, psImage *variance, pmCell *cell, pmConfig *config, const psRandom *rng) {
+psVector *ppSimMakeBias (pmReadout *readout, pmConfig *config, const psRandom *rng) {
 
     bool mdok;
+
+    pmCell *cell = readout->parent;
 
     psMetadata *recipe = psMetadataLookupMetadata(NULL, config->recipes, PPSIM_RECIPE); // Recipe
@@ -20,4 +22,7 @@
 	}
     }
+
+    psImage *signal = readout->image;
+    psImage *variance = readout->weight;
 
     int numRows = signal->numRows;