Abundances inferred from different sulphur lines as function of logarithmic reduced equivalent width. The upper row shows results from the disc-centre intensity, and the lower row shows results from the disc-integrated flux. The left panel shows results for different sets of oscillator strengths based on the 3D non-LTE model. The right panel shows results for different models based on GRASP oscillator strengths. The black squares are the same in the left and right panels of a given row. The error bars reflect the estimated ±5% uncertainty on the measured equivalent widths. Weighted linear regressions to different line groups shown, with the S I 675 nm triplet (not present in the CIV3 set; open symbols) given zero weight in the fits. The shaded rectangle shows the solar sulphur abundance given in Asplund et al. (2021) of A(S) = 7.12 ± 0.03.