Top left panel shows the inner disc temperature, kT_in, and coronal seed temperature, kT_{s, 1}, as a function of time for Swift J1727.8–1613. The top right panel presents the power-law photon index of NTHCOMP, Γ, as a function of time. The bottom left panel displays the time evolution of the intrinsic feedback fraction, η_{int, 1} and η_{int, 2}, obtained from the fit with the vkdualdk model. The bottom right panel shows the evolution of the inner disc radius (in units of gravitational radii) for inclination angles of 60° (blue) and 30° (black). For the calculation of the inner disc radius, we used a spectral hardening factor T_col/T_eff of 1.7, assumed a M_⊙ black hole, and set the distance to the source at 2.7 kpc.