In the previous section we showed that the three oxyhydrides have the same type of electronic structure, in which the additional electrons introduced during the reduction form delocalized bandstates rather than electron polarons. Here we provide further evidence for the bandstate electronic structure by exploiting differences in the temperature dependence of NMR parameters between metals and polaronic states. Thereby we measured longitudinal relaxation times T 1 and Knight shifts K of a representative sample (BTOD CA ) for range of temperatures ⇠ 100 300 K.