Core-surface conditions during core growth by pebble and (indestructible) planetesimal accretion. The core masses in the pebble and planetesimal cases range from 0.1 M⊕ to 0.59 M⊕ and 3.8 M⊕ , respectively. The pluses on the pebble line indicate 0.1 M⊕ core-mass intervals; the crosses on the planetesimal line indicate 1 M⊕ intervals. The locationof the 0.59 M⊕ point is indicated by the circles.