plot   'data_DFT_vqzE_error' using 1:2 smooth cspline notitle lt 2 , "" using 1:2 w p lt 2  title "FCI/vqz"
replot 'data_DFT_vqzE_error' using 1:3 smooth cspline notitle lt 3 , "" using 1:3 w p lt 3  title "FCI+PBE/vqz" 
replot 'data_DFT_vqzE_error' using 1:4 smooth cspline notitle lt 4 , "" using 1:4 w p lt 4  title "FCI+PBEot/vqz" 
set terminal eps linewidth 3
set output "DFT_vqzE_error.eps"
replot