Testing the suitability of our modelling for analyses at intermediate spectral resolution, e.g. for extragalactic applications, for the blue spectral regions of about 3900–4180 Å (upper) and 4310–4670 Å (lower panel set). The upper panel of each set shows the comparison of our best-fit synthetic spectrum for HD 119646 (blue line) with the observed high-resolution spectrum (grey line). The important spectral features are identified, including interstellar features that were not modelled. The lower panels of each set show the same spectra, however degraded to R = 1000, with the observations degraded to a S/N = 50 and showing some degree of oversampling. Two sets of model curves are shown in these cases, exemplifying the impact of a T_eff-variation by ±1000 K and the effects of a metallicity variation of ±0.3 dex, as indicated.