cbrange

The set cbrange command sets the range of values which are colored using the current palette by styles with pm3d, with image and with palette. Values outside of the color range use color of the nearest extreme.

If the cb-axis is autoscaled in splot, then the colorbox range is taken from zrange. Points drawn in splot ... pm3d|palette can be filtered by using different zrange and cbrange.

Please see set xrange for details on set cbrange syntax. See also set palette and set colorbox.