Please in the section of the input script below, would it be possible for someone to explain to me why the ylo and yhi are set to 45 and 80 respectively for the energy region?

"Appendix A

### LAMMPS code for calculating the GSF energy curve

of Cu

### file−name in.gsf-cu

units metal

boundary p s p

atom−style atomic

variable lattice equal 3.615

variable partial equal “v−lattice/sqrt(6)”

variable cna equal “v−lattice*(1+1/sqrt(2))/2”

lattice fcc ${lattice}orient x 11-2 orient y 111

orient z 1-10

region box block 0 21 0 20 0 20

create−box 1 box

create−atoms 1 box

region up1 block INF INF 62 INF INF INF

units box

group up1 region up1

region up2 block INF INF 64 INF INF INF

units box

group up2 region up2

region energy block INF INF 45 80 INF INF

units box

group energy region energy

neighbor 2.0 bin"