PoWR stellar atmosphere grids of OB-type stars I. Spectroscopic temperature and surface gravity diagnostics across metallicity

Normalized UV and optical spectra of the PoWR Vd3 grids. The model's parameters can be found in the corresponding modelparameters.txt files. Note that these files are uploaded for the reproducibility of the paper. For scientific purposes, we advise the reader to use the latest grids on the PoWR stellar atmosphere model website (https://www.astro.physik.uni-potsdam.de/PoWR)