set term svg font "Arial,24" background rgb "white"
set out "Plot.svg"
set title "Quantum osciallator variational energy"
set xlabel "Variational parameter α"
set ylabel "Energy (natural units)"
set tics out
set key bottom
set grid 
set monochrome 
plot [0:4][0:1] \
 "out.txt" with lines title "E(α)"\
,0.5 with lines title "exact"\