This section is used to define the colors of each layer for display purposes. This is only required for the X Windows version of the program and is not needed for the non-graphical version. This section contains a single line for each layer color desired. A line begins with a layer name followed by a comma separated list of style numbers for that layer. The style numbers are given in the dstyle file described in the Command Line Options and Environment Variable sections. The layer must be defined in the types section or the contact section.