set line color# <style> <thickness>
Sets current line attributes.
color#: one of the 16 GrADS default colors or a new color defined with set rgb
style: 1 - solid
2 - long dash
3 - short dash
4 - long dash, short dash
5 - dotted
6 - dot dash
7 - dot dot dash
thickness: values range from 1 to 6