1 Correction to: Discrete & Computational Geometry (2018) 61:136–160 https://doi.org/10.1007/s00454-018-0024-y

Figure 2 on page 144 was inappropriately uncredited. The diagram was created by David Eppstein. It first appeared in his blog post [1] and it was published as Fig. 15 in his article [2].