Index: trunk/Ohana/src/opihi/cmd.astro/cdensify.c
===================================================================
--- trunk/Ohana/src/opihi/cmd.astro/cdensify.c	(revision 38062)
+++ trunk/Ohana/src/opihi/cmd.astro/cdensify.c	(revision 38463)
@@ -73,6 +73,6 @@
   CHECKVAL(dY);
 
-  Nx = (Xmax - Xmin) / dX + 1;
-  Ny = (Ymax - Ymin) / dY + 1;
+  Nx = abs((Xmax - Xmin) / dX) + 1;
+  Ny = abs((Ymax - Ymin) / dY) + 1;
   
   Coords newcoords = graphmode.coords;