reset
set keycolumns 1
set key outside
set mxtics 1
set xtics 1
set logscale 

set xlabel 'bond order k'
set ylabel 'approximate energy [Ht]'
set terminal eps color
set output 'Energies-Order.eps'
plot [1:4]  \
'Energies-Order.dat' title '' using 1:3 with linespoints, \
'Energies-Order.dat' title 'Total' using 1:4 with linespoints