Index: trunk/psModules/src/camera/pmFPAfileIO.c
===================================================================
--- trunk/psModules/src/camera/pmFPAfileIO.c	(revision 29935)
+++ trunk/psModules/src/camera/pmFPAfileIO.c	(revision 33690)
@@ -53,4 +53,5 @@
 #include "pmSubtractionIO.h"
 #include "pmPatternIO.h"
+#include "pmFPAExpNumIO.h"
 #include "pmConcepts.h"
 #include "pmConfigRun.h"
@@ -231,4 +232,7 @@
         status = pmAstromModelReadForView (view, file, config);
         break;
+      case PM_FPA_FILE_EXPNUM:
+        status = pmExpNumRead(view, file, config);
+        break;
       case PM_FPA_FILE_ASTROM_REFSTARS:
       case PM_FPA_FILE_JPEG:
@@ -291,4 +295,5 @@
       case PM_FPA_FILE_DARK:
       case PM_FPA_FILE_PATTERN:
+      case PM_FPA_FILE_EXPNUM:
         {
             // create FPA structure component based on view
@@ -500,4 +505,9 @@
         status = pmFPAviewWriteSourcePlot (view, file, config);
         break;
+
+      case PM_FPA_FILE_EXPNUM:
+        // when ppStack output's EXPNUM file it uses a file rule where the file type is MASK
+        psError(PS_ERR_IO, true, "cannot write type EXPNUM (%s)", file->name);
+        return false;
 
       case PM_FPA_FILE_WCS:
@@ -562,4 +572,5 @@
       case PM_FPA_FILE_ASTROM_REFSTARS:
       case PM_FPA_FILE_LINEARITY:
+      case PM_FPA_FILE_EXPNUM:
         psTrace ("psModules.camera", 5, "closing %s (%s) (%d:%d:%d)\n", file->filename, file->name, view->chip, view->cell, view->readout);
         status = psFitsClose (file->fits);
@@ -636,4 +647,5 @@
       case PM_FPA_FILE_ASTROM_MODEL:
       case PM_FPA_FILE_ASTROM_REFSTARS:
+      case PM_FPA_FILE_EXPNUM:
         psTrace ("psModules.camera", 6, "NOT freeing %s (%s) : save for further analysis\n", file->filename, file->name);
         return true;
@@ -797,4 +809,5 @@
       case PM_FPA_FILE_ASTROM_REFSTARS:
       case PM_FPA_FILE_LINEARITY:
+      case PM_FPA_FILE_EXPNUM:
         psTrace ("psModules.camera", 5, "opening %s (%s) (%d:%d:%d)\n",
                  file->filename, file->name, view->chip, view->cell, view->readout);
@@ -996,4 +1009,5 @@
         status = pmAstromRefstarsWritePHU (view, file, config);
         break;
+      case PM_FPA_FILE_EXPNUM:
       case PM_FPA_FILE_ASTROM_MODEL:
       case PM_FPA_FILE_SX: