so that VASP can calculates imaginary and real parts of frequency dependent dielectric constant.
The values of these variables should be choosen as per user's requirement.
To know more about these tags refer to the VASP manual.
Once the OUTCAR from the last stage of VASP is obtained, one should run "./script_EELS" first and then upload
OMEGA.dat, EPS_RE.dat and EPS_IM.dat files here to get the file having data which can be used to plot EELS correspoing
to x, y and z-directions. The first column of the output file "LOSS_FN.txt" contains energies in eV,
while 2nd, 3rd and 4th columns contain the data corresponding to EELS along x, y, and z-directions, respectively.
Note: One may need to edit the script if they change the value of NOMEGA and OMEGAMAX in INCAR file.