n=9: 1903 reachable points of length <= 60, 454 classes of parallel directions
  class of alpha=2.079097: floating billiard finds 4 of the 4 (length, factor) pairs of the unfolding, none else
  class of alpha=0.720967: floating billiard finds 4 of the 4 (length, factor) pairs of the unfolding, none else
  class of alpha=1.073071: floating billiard finds 4 of the 4 (length, factor) pairs of the unfolding, none else
  class of alpha=2.144570: floating billiard finds 4 of the 4 (length, factor) pairs of the unfolding, none else
  class of alpha=0.462025: floating billiard finds 4 of the 4 (length, factor) pairs of the unfolding, none else
  class of alpha=0.546399: floating billiard finds 4 of the 4 (length, factor) pairs of the unfolding, none else
  class of alpha=0.539383: floating billiard finds 4 of the 4 (length, factor) pairs of the unfolding, none else
  class of alpha=0.531648: floating billiard finds 4 of the 4 (length, factor) pairs of the unfolding, none else
bands computed: 12684 (rays from O, both sides); largest number of segments of a simple preclosed piece: 156
odd n: in every class exactly m = 4 preclosed lengths c*lambda*sin(2j pi/n)/sin(pi/n), factors d_j = n'/gcd(n',j); classes by n': {9: 338, 3: 75, 1: 41}
  n'=9: factors 9,9,3,9  gcd 3  a quotient is n: no  classes: 338
  n'=3: factors 3,3,1,3  gcd 1  a quotient is n: no  classes: 75
  n'=1: factors 1,1,1,1  gcd 1  a quotient is n: no  classes: 41
DONE n=9 [8.2s]
