Used With Routines:   AXIS, BAR3D,   BOXPLOT,   CONTOUR,   CONTOURFS,   CONTOUR2,   OPLOT, PLOT, SHADE_SURF,   SHADE_SURF_IRR,   SURFACE

Corresponding System Variable:   !P.Thick

Controls the thickness of the lines connecting points. A thickness of 1.0 is normal, 2.0 is double-wide, etc.