set xrange [:5]
set key bottom

set xlabel "Internuclear distance (bohr) "
set ylabel "Atomization energy (hartree)"
set key font ",15"
set key spacing "1,8"

plot   'E_relat_dft' using 1:2 smooth cspline notitle lt 2 , "" using 1:2 w p lt 2 ps 1 title "FCI/avtz"
replot 'E_relat_dft' using 1:5 smooth cspline notitle lt 8 , "" using 1:5 w p lt 8 ps 1 title "FCI+SU-PBE-OT/avtz" 
replot 'E_relat_exact' using 1:2 smooth cspline notitle lt 7 , "" using 1:2 w p lt 7 ps 1 title "Exact" 
set terminal eps enhanced linewidth 6
set output "DFT_avtzE_relat.eps"
replot