[pstricks] Grids in pstricks

[Voie lactée]

Hello,

I try to draw grids in pstricks, with

\psgrid

command ; and when I want grid to be dotted, thus when I put the command

\psgrid[subgriddiv=0,griddots=10](3,2)


I don't have anything in my pdf document (I have only the labels of my 
axes).

I'm using iTexMac on Mac OS X.3, anbd I am compiling with Latex+PS

Thanks
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