When I run this code, the right dotted line disappears just by changing the position slightly. How do I make the right dotted line appear all the time without a border? set_plot, 'ps' device,/times,xoff=.25,yoff=1.5,xsize=8,ysize=8, $ /inches, /portrait map_set, 0, 0, 0, /mercator, /noborder, position=[0,.5,.5,.97] map_grid, latdel=10 map_set, 0, 0, 0, /mercator, /noborder, position=[0,.5,.499,.97] map_grid, latdel=10 device, /close end