report a list of rgb colors with the size specified in the a number of classes
show palette:scheme-colors "Divergent" "Spectral" 3
=> [[252 141 89] [255 255 191] [153 213 148]] ; The schemes-color primivite can be used with the scale-gradient primitive ask patches [set pcolor palette:scale-gradient palette:scheme-colors "Divergent" "Spectral" 9 pxcor min-pxcor max-pxcor]
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