Change the palette when viewing via "medit"

After saving the solutions, I need to view them via
medit in a terminal window. In order to compare the solutions, I would have to set the same palette for all solutions. Do you know of a command or option that allows you to modify the palette?
Here is an example :

load “medit”
mesh Th = square(10, 10, [2x-1, 2y-1]);
fespace Vh(Th, P1);
Vh u=2-xx-yy;
savesol(“u.sol”,Th, u, order=1);
medit(“u”, Th, u);

Thank you for your help.

The doc of medit is

but I thing it is not possible.