[ 0 100 -0.6 1.6 ] Axe2
[ (0) (25) (50) (75) (100) ] GradX
[ (-0.50) (0) (0.50) (1.00) (1.50) ] GradY
[
   10 -0.3
   20  0.15
   30  0.25
   40  0.40
   60  0.65
   80  0.73
] Plot

[ 10 20 30 40 60 80 ]
[ -0.3 0.15 0.25  0.40 0.65 0.73 ]
WithLines Red Cross