Accretion disk model of PSO J0309+27. The SS73 model that best represents our data is shown in red. Orange dashed line and green dashed-dotted line represent the model with the minimun and maximun value of M_BH respectively (5.2 × 10⁸ and 8.8 × 10⁸ M_⊙). In black, we showed the optical and NIR (smoothed) spectra. The PS1 y and the TNG J and K photometric data are shown in light blue. In grey, we highlighted the photometric point and the part of the spectrum affected by HI absorption (not used for the disk modeling).