Dust depletion fits for the nine lowest metallicity GRB-DLAs in our sample. The diamond points are the observed relative abundances, the dot-dashed line follows the expected depletion at a strength of the best fit F_∗, and the dashed line represents the best fit metallicity. Unfilled markers represent low-resolution spectral data (we continue this in all following plots), and squares with up (down) arrows represent lower (upper) limits.