Index: trunk/Ohana/src/opihi/dvo/imbox.c
===================================================================
--- trunk/Ohana/src/opihi/dvo/imbox.c	(revision 20066)
+++ trunk/Ohana/src/opihi/dvo/imbox.c	(revision 20184)
@@ -55,4 +55,9 @@
 	haveNx = gfits_scan (&header, "IMNAXIS1",   "%d", 1, &Nx);
 	haveNy = gfits_scan (&header, "IMNAXIS2",   "%d", 1, &Ny);
+    }
+
+    if (!haveNx && !haveNy) {
+	haveNx = gfits_scan (header, "ZNAXIS1",   "%d", 1, &Nx);
+	haveNy = gfits_scan (header, "ZNAXIS2",   "%d", 1, &Ny);
     }