Linear correlations between ϵ¹⁸²W (including the ¹⁸²Hf abundance) and ϵ¹⁸³W (i.e. ratios internally normalised to ¹⁸⁶W/¹⁸⁴W and relative to the solar ratios, multiplied by 10 000) derived from the lowest and the upper limit of the observations (solid black lines) and from the abundances calculated at the end of the evolution of Set 2 models of Z = 0.014 (blue lines) and Z = 0.03 (green lines), with stellar mass indicated by corresponding labels and different line types: 2 M_⊙ (short-dashed), 3 M_⊙ (solid), and 4 M_⊙ (long-dashed). We note that the M = 3 M_⊙Z = 0.014 line overlaps with the line of the observational upper limit. The dotted lines indicate the solar composition. Addition of s-process material produces negative values, while removal correspond to positive values.