Index: /issm/trunk-jpl/src/m/plot/webgl.js
===================================================================
--- /issm/trunk-jpl/src/m/plot/webgl.js	(revision 19807)
+++ /issm/trunk-jpl/src/m/plot/webgl.js	(revision 19808)
@@ -117,9 +117,13 @@
 } //}}}
 function rgb(value, min, max) { //{{{
+	
+	var normalizedValue;
 					
 	colorbar=colorbars["rainbow"];
 
 	value = clamp(value, min, max);
-	var normalizedValue = (value - min) / (max - min);
+	if((max-min)!=0) normalizedValue = (value - min) / (max - min);
+	else normalizedValue = value;
+
 	var index = clamp(Math.round(normalizedValue * colorbar.length), 0, colorbar.length - 1);
 	return colorbar[index];