Distribution of the spectral parameters obtained in the fits to the IBIS/ISGRI spectra of V404 Cyg analysed in this work. Grey bars are used to describe the total parameter distribution. Green, blue, and red symbols are used to highlight the best-fitting model, according to our model selection criteria (Sect. 2.2). Blue: comptonization models with constrained T_e (Fig. 1a) further divided into hard (Γ ≤ 1.7; dark blue) and soft spectra (Γ > 1.7; light blue). Green: comptonization models with unconstrained T_e (Fig. 1b). Red: p–value <0.05 fits. (Fig. 1c). In the top panels we show the distribution of the nthcomp parameters, while in the bottom panels we show the compps parameters.