All these transitions are taken into account, but you need at least one completely filled and completely empty band to build the BSE matrix, in order to include all the metallic bands.I do not know why there is no transition from the fully filled bands to partially filled bands or partially filled bands to empty bands
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Also is there any tag in Yambo to include the Drude term (the intraband term)?
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DrudeWBS=(omegap, lifetime)
Best,
Daniele