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HELP

function f(x) { y = 8524 * x - 1983; return y }
...
aX = 0.3; bX = 0.5; aY = 1000; bY = 2500
Dx = 0.05; Dy = 100
...
xx = [0.3,0.4,0.5]; yy = [1000,1500,2000,2500]
Qx= [ 0.41, 0.46, 0.44, 0.47, 0.42, 0.39, 0.41, 0.44, 0.43, 0.44 ]
Qy= [ 1280, 1810, 1610, 1860, 1490, 1210, 1720, 1900, 1880, 2150 ]
C2 = "orange"; L2x =[0.43, 0.43], L2y = [1000,2500]
...
AX=BX=AY=BY=""
...
AAX=aX; BBX=bX; AAY=aY; BBY=bY