Define pattern characteristics. PATTERN1
defines a single map pattern that is repeated for each of the 50 map areas
(states). The pattern is an empty fill with a blue border. VALUE= defines
a map/plot pattern, which cannot be used by the blocks. Specifying a color
causes PATTERN1 to generate only one pattern definition. REPEAT= specifies
the number of times to repeat the pattern definition.
pattern1 value=mempty color=blue repeat=50;