Corner plot showing the one- and two-dimensional posterior distributions for each free parameter in two-component temperature-gradient model: isothermal inner and a temperature-gradient outer components model for numerous data set: PIONIER + MATISSE + MIDI +SED. The run was made with 2000 steps and 150 walkers. The first 200 steps are considered to be “burn-in” phase, and 1800 steps are shown where the walkers converged.