set parametric
set trange [-1:1]
set xrange [-1:1]
set yrange [-0.25:1]
set nokey
set notics
set sample 1000
set term postscript enhanced
set output 'tissi.eps'
plot 3 * t * log10(t) - 1.0/36 * exp(-(36 * t - 36 / exp(1)) ** 4), t