Index: /issm/trunk-jpl/src/m/plot/processdata.m
===================================================================
--- /issm/trunk-jpl/src/m/plot/processdata.m	(revision 28098)
+++ /issm/trunk-jpl/src/m/plot/processdata.m	(revision 28099)
@@ -173,5 +173,6 @@
 		data(find(data<bounds(1)))=bounds(1);
 		if any(data<=0),
-			error('Log option cannot be applied on negative values. Use caxis option (Rignot''s settings: [1.5 max(data)])');
+			warning('Log option cannot be applied on negative values. Using 1 as default, otherwise use ''caxis'' option');
+			data(find(data<0)) = 1;
 		end
 		pos=find(~isnan(data));
@@ -203,5 +204,6 @@
 		data(find(data<bounds(1)))=bounds(1);
 		if any(data<=0),
-			error('Log option cannot be applied on negative values. Use caxis option (Rignot''s settings: [1.5 max(data)])');
+			warning('Log option cannot be applied on negative values. Using 1 as default, otherwise use ''caxis'' option');
+			data(find(data<0)) = 1;
 		end
 		pos=find(~isnan(data));