Notes. The position and the ID are from Gaia DR3 (Gaia Collaboration 2023a), except for the objects marked with ^a, whose information comes from Pan-STARRS Survey DR1 (Chambers et al. 2016). The distance ρ within the rectified plane of M 31 is in fractions of the major isophotal radius ρ₂₅. The Class (name of best class) and the probability of the object being a quasar P_QSO (in %) from the Discrete Source Classifier-Combmode from Gaia DR3 (Gaia Collaboration 2023b); when an object is missing a Class, we list its Class as inclassified, “uncl”, and if the object has no entry, then the Class is set to not applicable, “NA”. References: (1) Gaia Collaboration (2023a); (2) Storey-Fisher et al. (2024); (3) Dey et al. (2023); (4) Huo et al. (2013); (5) Neugent et al. (2012); (6) this work; (7) Dong et al. (2018); (8) Liao et al. (2019); (9) Massey et al. (2019); (10) Dahari & De Robertis (1988); (11) Meusinger et al. (2010); (12) Dorn-Wallenstein, Levesque, & Ruan (2017); (13) Nedialkov et al. (2018); (14) Rao et al. (2013); (15) Paiano et al. (2017). Multiple references are given when we have reanalyzed spectra from the literature to remeasure the redshifts. Finally adopted redshift z_adopt is explained in Sect. 4.3. The analyzed original spectra are suffixed by A (Apache Point) or B (BTA) in the last column, while the reanalyzed literature spectra are suffixed by M (Mayall) or L (LAMOST). Here we show only an example subset of the table, for guidance. The entire table is only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/.