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HELP

function f(x) { y = 1/0; return y }

aX =1900; bX = 2010; aY = 0; bY = 50
Dx = 5; Dy = 1

L1x=[1901,1911,1921,1931,1941,1951,1961,1971,1981,1991,2001]
L1y=[ 49,   38,  27,  21, 15,   11,   8,   5,   3,   3,  2]
xx=[1900,1920,1940,1960,1980,2000]; yy=[10,20,30,40,50]
Q1x=L1x; Q1y=L1y

AX=BX=AY=BY=""

s0=["1900",1900,-1.5]; s1=["1920",1920,-1.5]; s2=["1940",1940,-1.5]; s3=["1960",1960,-1.5];
s4=["1980",1980,-1.5]; s5=["2000",2000,-1.5]
T0=["10",1896,10]; T1=["20",1896,20]; T2=["30",1896,30]; T3=["40",1896,40]; T4=["50",1896,50]; T5=["0",1896,0.5]