Relation between p parameter and external field g_tot for Milky Way (blue) and Andromeda (orange) satellite dSphs. The dashed line describes Milgrom's constant a₀. Uncertainties are not shown to keep the plot legible (see Tables C.1 and D.1 for uncertainties on p). The external field is Newtonian and consists of the field by the host galaxy and the internal field of the satellite. A logarithmic fit function (solid green curve) described by Eq. (56) suggests a functional relation, p(g_tot).