This sets the line style according to one of eight predefined
patterns (also see plstyl).
n
(PLINT, input)
Integer value between 1 and 8. Line style 1 is a continuous line,
line style 2 is a line with short dashes and gaps, line style 3 is
a line with long dashes and gaps, line style 4 has long dashes and
short gaps and so on.