Least-squares fitting between the observed and modeled PV diagram (black curve) and 3D cube (red curve) as a function of inclination of the torus (left panel) and the black hole mass (right panel). The criterion is defined in Sect. 4.4.2. The curves have been slightly translated vertically for clarity. If there is a minimum for inclination, there is none for M_BH, and larger masses are preferred, as for NGC 1672.