#set size ratio -1
unset key

unset border
unset xtics
unset ytics

range_x = 1.5
range_y = 3.0

set xr [-range_x:range_x]
set yr [0:range_y]

set style fill solid 1 noborder

#plot -(x-1)**2*(x+1)**2+0.5 w filledcurves
plot -0.5*(x-1)**2*(x+1)**2+1.0 w filledcurves
rep 2.0*(x-1)**2*(x+1)**2+1.0 w filledcurves

set style line 1 pointtype 7
rep "data.dat" linestyle 1 ps 2