This command sets the line typ for contour line set <ic> for the data set <ik>. The colours are numbered like the pens on a HP7475 plotter. Allowed values for <p> are:
0 : no line 1 : solid line 2 : - - - - - - - - - - - - 3 : -- -- -- -- -- -- 4 : --- --- --- --- 5 : ---- ---- ---- 6 : ----- ----- -----