Color map manipulation

Dear ncl experts,

 I am learning to produce plots using ncl. How can I manipulate "precip_diff_12lev "color map to have white color around zero (i.e. over [-0.1 and +0.1]) for the range /-0.3, -0.2, -0.1, 0., 0.1,0.2/. I am also wondering if the "white" color in the "precip_diff_12lev "can be replaced with "grey". Your help will be highly appreciated.

 Many thanks,

Freddie

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