This folder contains 4 gnuplot script files and 1 data file for the fitting 
procedure. Each of them can be run in gnuplot using:
gnuplot 'gnuscript_xxxx'

gnuscript_202020_down_conduction_band --> fit the energy data for spin down 
conduction band with the full fitting function (65 parameters) and produce 
the data along a fixed path in momentum space (L-Gamma-Z)

gnuscript_202020_up_conduction_band --> fit the energy data for spin up 
conduction band with the full fitting function (65 parameters) and produce 
the data along a fixed path in momentum space (L-Gamma-Z)

gnuscript_202020_down_conduction_band_smiplified --> fit the energy data 
for spin down conduction band with the simiplified fitting function 
(5 parameters) and produce the data along a fixed path in momentum space 
(L-Gamma-Z)

gnuscript_202020_up_conduction_band_smiplified --> fit the energy data for 
spin up conduction band with the simiplified fitting function (5 parameters) 
and produce the data along a fixed path in momentum space (L-Gamma-Z)

The latter two gnuscripts should generate the data for Figure. 2(d) in the 
main text and the former two gnuscripts should generate the fitting results 
mentioned in the appendix.
