Longitudinal magnetic field B_ℓ (top panel) and temperature variations d T (bottom panel) of TWA 7 (red dots) and the QP GPR fit to the data (cyan full line) with the corresponding 68% confidence intervals (cyan dotted lines). The residuals, shown in the bottom plot of each panel, yielded rms of 8.2 G and 2.9 K (${\chi }_{\mathrm{r}}^2=0.67$ and 0.85). March 01 of 2019, 2020, and 2021 at noon correspond to x-values of −456,−90, and 275, respectively. A zoom in on the 2021 data is shown in Fig. B.1.