Three-dimensional view of the AR 12546. From bottom to top: SDO/HMI magnetogram, IBIS Fe I core with blue dots overplotted, and Hinode/EIS FIP bias map. The purple surface represents the equipartition layer (0.8 < c_s/v_A < 1.2) as inferred from the spectropolarimetric inversions. Selected field lines from a PFSS extrapolation of the coronal field link the blue dots with regions of high-FIP bias on the eastern and southern edges of the sunspot (i.e., in the penumbra; see Baker et al. 2021 for more details).