Best-fitting models for the main UV lines of HD206165, HD198478 and HD164353. Each row of plots shows the lines of the same model with a given shock temperature T_x. The different colors/line styles represent the different adopted values of clumping, namely: red-dashed stands for f_∞ = 1.0, orange/full for f_∞ = 0.5, green-dash-dotted for f_∞ = 0.2 and blue-dotted for f_∞ = 0.1. The associated log(L_x/L) and Ṁ for each clumping and shock temperature value are displayed in Tables 6 and 7.