0 10 20 30 Distance to anchor 0. 0 0. 2 0. 4 0. 6 0. 8 1 . 0 Weight

Upper bound Sigmoid (4) γ = 0 .8 We thank all reviewers and ACs. We appreciate the many positive and constructive comments. We will update our paper and supp. Unfortunately, [28] was lost from the citations in L80, which may have made this unclear.