# Common settings
set size square
set xr [0:1]
set xtics 0.25
set yr [0:1]
set ytics 0.25
set key inside left

# Gamma curve
set term svg
set output "tmp.svg"
plot exp(2.2 * log(x)) < 0.5 ? 0.5 : -2 lw 2 title "", \
     x title "gamma 1.0" lw 4, \
     exp(1.8 * log(x)) title "gamma 1.8" lw 4, \
     exp(2.2 * log(x)) title "gamma 2.2" lw 4

