n=7: 1931 reachable points of length <= 60, 476 classes of parallel directions
  class of alpha=0.430965: floating billiard finds 3 of the 3 (length, factor) pairs of the unfolding, none else
  class of alpha=0.868213: floating billiard finds 3 of the 3 (length, factor) pairs of the unfolding, none else
  class of alpha=0.415666: floating billiard finds 3 of the 3 (length, factor) pairs of the unfolding, none else
  class of alpha=0.511033: floating billiard finds 3 of the 3 (length, factor) pairs of the unfolding, none else
  class of alpha=0.309674: floating billiard finds 3 of the 3 (length, factor) pairs of the unfolding, none else
  class of alpha=0.262922: floating billiard finds 3 of the 3 (length, factor) pairs of the unfolding, none else
  class of alpha=0.194297: floating billiard finds 3 of the 3 (length, factor) pairs of the unfolding, none else
  class of alpha=0.206432: floating billiard finds 3 of the 3 (length, factor) pairs of the unfolding, none else
bands computed: 9500 (rays from O, both sides); largest number of segments of a simple preclosed piece: 150
odd n: in every class exactly m = 3 preclosed lengths c*lambda*sin(2j pi/n)/sin(pi/n), factors d_j = n'/gcd(n',j); classes by n': {7: 419, 1: 57}
  n'=7: factors 7,7,7  gcd 7  a quotient is n: no  classes: 419
  n'=1: factors 1,1,1  gcd 1  a quotient is n: no  classes: 57
DONE n=7 [6.5s]
