hi,
normally energy eigenvalues ( from linear methods) are supposed to be
reliable
to within 1 Ry of the fermi energy. so you would expect that e2 to be ok for
up to 1 Ry. suppose you have 1000 energy eigenvalues in this range, then the
spacing (dE) is about 2/1000 = 0.002 Ry. Broadening could be 0.004 or even
larger. experiments normally have an accuracy of about 0.05 eV which is
0.004 Ry.......these are rough estimates.....
s.auluck
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