folder: m_1:data effective mass=1, m_3_5:data effective mass=3.5, m_var:data variable effective mass
files:
- ch0.png: suszeptibility
- Im_eps.png: imaginary part of the loss function Im{1/eps}
- dispersion.txt: q_parallel in rez. Angstroem (first column) vs. plasmon energy in eV (sencond column) for q_perp=0
- m_vs_E.txt: energy in eV (first column) vs. effective mass (second column) 
