Index: trunk/Ohana/src/relphot/src/args.c
===================================================================
--- trunk/Ohana/src/relphot/src/args.c	(revision 39926)
+++ trunk/Ohana/src/relphot/src/args.c	(revision 40291)
@@ -325,4 +325,9 @@
     remove_argument (N, &argc, argv);
     CALIBRATE_STACKS_AND_WARPS = TRUE;
+  }
+  USE_MCAL_PSF_FOR_STACK_APER = FALSE;
+  if ((N = get_argument (argc, argv, "-use-mcal-psf-for-stack-aper"))) {
+    remove_argument (N, &argc, argv);
+    USE_MCAL_PSF_FOR_STACK_APER = TRUE;
   }
 
@@ -696,4 +701,10 @@
   }
 
+  USE_MCAL_PSF_FOR_STACK_APER = FALSE;
+  if ((N = get_argument (argc, argv, "-use-mcal-psf-for-stack-aper"))) {
+    remove_argument (N, &argc, argv);
+    USE_MCAL_PSF_FOR_STACK_APER = TRUE;
+  }
+
   /* define time */
   TimeSelect = FALSE;