2D temperature snapshots zooming down to sub-au scales showing the evolution of a 1 M_⊙ cloud core with an initial temperature of 10 K and outer radius of 3000 au. The velocity streamlines in black indicate the infalling material and also the mixing within the second core at the last snapshot. The solid and dashed white contours indicate the first and second accretion shocks, respectively. Note the different spatial scales from top left to bottom left.