def from_dos(cls, dos: CompleteDos):
"""
:param dos: CompleteDos object with project element-orbital DOS. Can be obtained from Vasprun.get_complete_dos.
:param sigma: Smearing for Gaussian.
:return: XPS
"""
total = np.zeros(dos.energies.shape)
for el in dos.structure.composition.keys():
spd_dos = dos.get_element_spd_dos(el)
for orb, pdos in spd_dos.items():
weight = CROSS_SECTIONS[el.symbol].get(str(orb), None)
if weight is not None:
total += pdos.get_densities() * weight
else:
warnings.warn(f"No cross-section for {el}{orb}")
return XPS(-dos.energies, total / np.max(total))
