gnuplot map view customizing color

As seen, the default colour in map-view in Gnuplot for zero value is black. I want 开发者_高级运维to make it white and display other colours for other data. May you tell me how to customise the colours please? Thank you.

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See the help for palette:

gnuplot> help set palette

After setting the palette, you give for example with points palette to the splot command.