Bayes factor of the mock tests performed on the FORS2/MXU (left) and K17 (right) samples. Each panel represents the results for a different value of v_rot, mock/σ, as given in the panel title. Squares and crosses refer to the linear and flat rotational model (LM, FM), respectively. The color of the markers (red, green, and blue) represents a different simulated position angle (99, 144, and 189 degrees, respectively). The purple circle indicates the Bayes factor derived for the real data sets (for the one referring to the K17 sample, see Sect. 4). Black solid lines discriminate between the strengths of the evidence for each case (yellow: strong; pink: moderate; green: weak; gray: inconclusive).