The syntax of the "set palette defined", at page 188 of the pdf manual, could be presented as set palette defined { ( <gray1> <color1>, <gray2> <color2> {, <grayN> <colorN>}... ) } In that way, it would be clear that at least two points must be present.
The syntax of the "set palette defined", at page 188 of the pdf manual, could be presented as set palette defined { ( <gray1> <color1>, <gray2> <color2> {, <grayn> <colorn>}... ) }</colorn></grayn></color2></gray2></color1></gray1> In that way, it would be clear that at least two points must be present.
The syntax of the "set palette defined", at page 188 of the pdf manual, could be presented as set palette defined { ( <gray1> <color1>, <gray2> <color2> {, <grayN> <colorN>}... ) } In that way, it would be clear that at least two points must be present.