Core and envelope compositions under the different solid-envelope interaction models presented in Table 2. The dashed black line represents the outer boundary to the envelope and the solid black line the inner boundary. Everything interior to the black solid line is considered as the core. The composition of the core and whether this is mixed is not considered in this work. Rather a constant core density of 3.2 g cm⁻³ is used. When envelope enrichment is considered this can either create a compositional gradient or there can (a) mixed convective zone(s), as shown by the two halves.