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HELP

function f(x) { y = 1/0; return y }
...
aX = 8; bX = 18; aY = 0; bY = 20
Dx = 1; Dy = 5
...
Lx=[8,  8.5, 9,  9.5, 10, 10.5, 11, 11.5, 12, 12.5, 13, 13.5, 14, 14.5, 15, 15.5, 16, 16.5, 17, 17.5, 18]
Ly=[12,12.1,12.2,12.3,12.5,13.2,14.6, 16, 17.2, 18, 19, 19.3, 19,  18,  17, 15.1,13.5,12.8,12.5,12.45,12.4]
...
AX=BX=AY=BY=""
...
AAX=aX; BBX=bX; AAY=aY; BBY=bY