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PEN=<list_of_device-dependent_control_words> 
(in PLOT operation) determines the default setting of various graphical
attributes of texts to be plotted in the graph like those given in
HEADER and TEXTS specifications. The settings of PEN are temporarily
overridden by corresponding device-dependent statements given in any
of the other specifications.
Examples:
  PEN=[Times(24)][rot(0)]
tells that texts should be written in 24 Point Times font. [rot(0)]
means that the rotation angle of texts is 0.
  PEN=[RED] or PEN=[color(0.333,1,1,0)]    (see also COLORSYS?)
gives `red' as the default color in all texts.