Index: trunk/ppMerge/src/ppMergeScaleZero.c
===================================================================
--- trunk/ppMerge/src/ppMergeScaleZero.c	(revision 7759)
+++ trunk/ppMerge/src/ppMergeScaleZero.c	(revision 7840)
@@ -46,5 +46,5 @@
     assert(config);
 
-    if (!options->scale && !options->zero) {
+    if (!options->scale && !options->zero && !options->exptime) {
         return true;                    // We did everything we were asked for
     }
@@ -137,5 +137,5 @@
                         (*zeros)->data.F32[i][cellNum] = zero;
                         psTrace(__func__, 9, "Zero for input %ld, chip %ld, cell %ld: %f\n", i, j, k, zero);
-                   } else if (!first && fromConcepts) {
+                    } else if (!first && fromConcepts) {
                         psLogMsg(__func__, PS_LOG_WARN, "PPMERGE.SCALE and PPMERGE.ZERO have been set "
                                  "for some, but not all cells --- we will re-measure it for all cells.");