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f1(x) = a*x
a = 0.5
fit f1(x) 'before.dat' using 1:2 via a
f2(x) = b*x
b = 0.5
fit f2(x) 'after.dat' using 1:2 via b
set xlabel "Length of input"
set ylabel "CPU time to parse"
plot a*x title 'a*x (Before)',\
b*x title 'b*x (After)',\
"before.dat" using 1:2 title 'Before', \
"after.dat" using 1:2 title 'After'