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function f(x) { y = 1/0; return y }
...
aX = 1890; bX = 2020; aY = 0; bY =65
Dx = 10; Dy = 5
...
C1="red"; C2="blue"; C3="green"; xx=[1900,1950,2000]; yy=[25,50]
L1x=[1900,1970,2010]
L1y=[62,19,4]
L2x=L1x
L2y=[22,39,28]
L3x=L1x
L3y=[16,42,60]
Q1x=L1x; Q1y=L1y; Px=L2x; Py=L2y; Q3x=L3x; Q3y=L3y
...
AAX="   1900"; BBX="2010    "; AAY=aY+"%"; BBY=bY+"%"
...
T0=["X",2013,7.5]; T1=["Y",2013,32.5]; T2=["Z",2013,57.5]