Normalised VLT/X-shooter spectra of the objects studied in this paper (Table 1), combining the UVB, VIS, and NIR arms. Line identifications are indicated above the spectrum. We point out the presence of telluric absorption features centred at 690, 720, 820, 920, 1400, 2010 and 2060 nm. The attenuated region between the H and the K band (1830–1980 nm) has been omitted. The blue part of the spectrum for B163, B331, and B337 is not visible due to severe interstellar extinction.