(a) TESS phase-folded data (gray points) with Allesfitter model (red curve), and binned data (blue points). The lower panel shows the residuals after subtracting the model and baseline from the relative flux. (b)–(d) Phase-folded ground-based photometry data from WST, WBRO, and LCOGT (cyan, red, and green points), model attempt (red curve) from Allesfitter, and the residuals in the lower panels follow the same color scheme as the upper panels, clearly separating raw and binned data. In the top panel of all plots (a)–(d), we remove the baseline from the relative flux, which represents an offset. The ground-based photometry data points are not used in global modeling because the data do not have a sufficient baseline and do not consistently capture both ingress and egress (see Section 3.2).