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Fig. E.1.

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Top panels: Observed (black line) and ZDI modeled (red line) LSD Stokes I (left) and V (right) profiles of IRAS 04125+2902 for our 2024 December data set. Both fits to the LSD Stokes I and V profiles yield χr2 = 1, i.e., are consistent with the data down to photon noise. Rotation cycles (counting from 3, see Table B.1) are indicated to the right of the LSD profiles, while ±1σ error bars are added to the left of the Stokes V signatures. Bottom panel: Photometry derived from dT (red circles) and ZDI fit (green line), reproducing most of the observed variability caused by large surface brightness features.

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