ReadMe: Figures 2-6 Data Each Excel spreadsheet corresponds to a figure in the text. Each sheet inside a spreadsheet corresponds to a parameter. Normalised diffusion parameters are expressed as logarithms. Legends L = conducting shell thickness sigma = shell conductivity delta_norm = normalised diffusion depth (w.r.t. L) T_norm = normalised diffusion time (w.r.t. 5.27 half-synodic period) lambda3 = System-III Jovian east longitude BCF = Chapman-Ferraro magnetic field strength BJ = Jovian magnetic field strength next to the magnetopause BG = Ganymedean magnetic field strength next to the magnetopause Pext = effective external (thermal, magnetic, and orthogonal dynamic) pressure on the magnetopause Delta RMP = magnetopause movement (change in standoff distance) Delta BCF = change in Chapman-Ferraro magnetic field