Estimated LOS magnetic field in the 2025 August 8 (top row) and 2025 October 5 (bottom row) cavities and their embedded prominences, masked to show only 3σ significant observations (first column). The second column shows the signed red-wing amplitude of the antisymmetric Stokes V profile. Each plot shows the egg fits to the cavity, for context. The purple lines represent the slit positions shown in Figures 4 and 5 panels (A)–(D), respectively. The cyan boxes represent the location of the spectra shown in Figures 4 and 5 panels (E)–(H), respectively. For the 2025 October 5 cavity, we outline the prominence in green based on the continuum signal in the Fe XIII observation.