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You can open the Code and modify the function: see the Help
HELP

function f(x) { y = 100 + 4.362*x; return y }
...
aX = 0; bX = 80; aY = 0; bY = 450
Dx = 10; Dy = 50
...
Qx=[17, 33, 41, 54, 62, 70, 75]
Qy=[191,240,285,338,381,397,419]
...
AX=BX=AY=BY=""
...
AAX=aX; BBX=bX; AAY=aY; BBY=bY