MCMC results for the asymmetry angle of the first-order skewed ring model using MATISSE data from the 2021ab epoch (orange), alongside re-reduced GRAVITY data (blue) that were obtained close in time (similar to Fig. 4). The horizontal dashed lines indicate the averaged H, K and L band estimates for the direction of the semi-major axis of the inner dust ring. In the top left corner, we indicate the approximate Keplerian period based on the stellar parameters, the best-fit temperature gradient inner radius R_in, and the parametric half-light radius l_a.