Physical structures of disk midplanes for pre-solar nebula from Hayashi (1981; in green), and for 0.1 MMSN disk by 1 Myr evolution from Eistrup et al. (2018; in blue). Solid profiles are for temperature. Dotted profiles are for number density. The vertical grey lines indicate the positions of the icelines of H₂O, CO₂, CH₄ and CO by 1 Myr evolution for the 0.1 MMSN disk in Eistrup et al. (2018). The grey arrows on each of the vertical lines indicate which species each line is associated with, and how the iceline moves over time (all inwards).