[Gmsh] a question about the colors in the post-processing view

[carette philippe]

Hi,
I try the new release1.5.
Very nice, and tx a lot for the nodes view option, in the visibility screen.
Extrude feature works good now  (i got some double nodes, with extrude, 
in the 1.46 release, and error with Code Aster using)

I have a question about the post-processing view :
With a merge file, a strain tensor component, saying XX, change from 
-100 to 100, so the zéro value is in yellow/green.

How can i viszualize the absolute value with Gmesh ?
I didn't find in the doc. files.

Tx a lot for your help, and tx another time for this very good soft.