#plot to png file
set terminal png small color
set output 'ssia.png'

#define "ssia" function
ssia(x) = 25*(12/(61-x))
set samples 61

#pretty up the output
set logscale y
set yrange [5:300]
set ylabel "% (log)"
set xtics 0,12
set xlabel "months"
set grid xtics ytics mytics

#plot (to file)
plot [0:60] ssia(x) notitle with fsteps
#one can do a background by also plotting:
#5 with filledcurves x2 lt 5