Index: trunk/ppSim/src/ppSimLoop.c
===================================================================
--- trunk/ppSim/src/ppSimLoop.c	(revision 13017)
+++ trunk/ppSim/src/ppSimLoop.c	(revision 13022)
@@ -716,5 +716,6 @@
 
     if (fpa->hdu) {
-        fpa->hdu->header = wcsHeader(ra0, dec0, pa, scale * binning, 0.0, 0.0, 1, 1);
+        fpa->hdu->header = wcsHeader(ra0, dec0, pa, scale * binning, 0.5 * (bounds->x1 - bounds->x0),
+                                     0.5 * (bounds->y1 - bounds->y0), 1, 1);
     }