Notes. Column 1: primary atomic identification and corresponding laboratory wavelength in Å; Cols. 2 and 4: RVs for the July and the August observations respectively, after applying the heliocentric corrections of +27 km s⁻¹ for July and +24 km s⁻¹ for of August; Cols. 3 and 5: corresponding full-widths at half maximum intensity. Columns 6–9: measurements performed on the combined July+August spectrum after correcting for the adopted −179 km s⁻¹ systemic velocity of M 33. Column 6: RV of the emission lines; Col. 7: corresponding equivalent width; Col. 8: centroid of the P Cyg absorption component when present; and Col. 9: velocity of the P Cyg absorption edge (i.e. the location where the absorption reaches the continuum). RVs and FWHM’s are in units of km s⁻¹; EWs are in units of Å, and the negative sign in the column heading indicates emission. Asterisk indicates the line was used to determine the RV of the system.