line plot By     ! Interpolate along a line, make plot file, plot component By  
0 0 12 0         ! End points of line x1,y1,x2,y2
50               ! Number of intervals along line
line plot By     ! Set up second line
0 0.25 12 0.25
50
line plot By     ! Set up third line
0 0.5 12 0.5
50
end