The adiabatic shifting d-echo experimental spectra together with the best fits are given in Fig. , while the extracted NMR parameters are summarized in Table . A qualitative comparison of the spectra reveals that the main spectral features are very sim-ilar among the three samples, except of course for the sharp peak appearing at zero frequency in the quadrupolar dimension due to the impurity (TiD 2 ) in BTOD EXCH . Interestingly, despite the anionic disorder and the presence of oxygen vacancies in these solids the spectra display very well-defined Pake patterns in the quadrupolar dimension indicating high structural fidelity of the local hydride geometry throughout the materials. Furthermore, the quadrupolar coupling constants C Q in Table are relatively small and constant at ⇠ 25 kHz (typical 2 H environments have C Q up to 200 kHz) suggesting high local symmetry as expected for an approximately cubic crystal system. The quadrupolar tensor parameters and the Euler angles (see Table ) match within error among the investigated samples, which implies that the local hydride environment and electronic structure type is identical in the three oxyhydrides.