Index: trunk/psLib/src/astro/psCoord.h
===================================================================
--- trunk/psLib/src/astro/psCoord.h	(revision 4937)
+++ trunk/psLib/src/astro/psCoord.h	(revision 4957)
@@ -10,6 +10,6 @@
 *  @author GLG, MHPCC
 *
-*  @version $Revision: 1.43 $ $Name: not supported by cvs2svn $
-*  @date $Date: 2005-08-31 22:28:35 $
+*  @version $Revision: 1.44 $ $Name: not supported by cvs2svn $
+*  @date $Date: 2005-09-07 21:33:48 $
 *
 *  Copyright 2004-2005 Maui High Performance Computing Center, University of Hawaii
@@ -404,4 +404,14 @@
 
 
+/** Calculates the derivative of the specified psPlaneTransform with respect to x and y.
+ *
+ *  @return psPlane*         The derivative.
+ */
+psPlane *psPlaneTransformDeriv(
+    psPlane *out,
+    const psPlaneTransform *transformation,
+    const psPlane *coord
+);
+
 /// @}