FILENAMES:
 
   a.000 -- curves up to conductor 100000
   a.001 -- curves from conductor 100000 to 200000
   ...
   a.n   -- curves from conductor n*10^5 to (n+1)*10^5
            (up to 10^8)

   p.00  -- curves up to 10^8 with prime conductor
   ...
   p.n   -- curves between n*10^8 and (n+1)*10^8 with prime conductor
   ...
   p.99  -- finishes at 10^10 prime conductor

FORMAT OF a FILES:

A group as follows for each isogeny class.

conductor [ordered_prime_divisors_of_conductor]   rank  L^(rank)(1)/rank!  isogeny_number  ??modular_degree
a_invariants    ord(Delta)     analytic_sha     torsion_subgroup
....
a_invariants    ord(Delta)     analytic_sha    torsion_subgroup


COMMENTS:

  isogeny_number - This number is the longest degree of a chain of isogenies
                   between non-isomorphic curves.   For example, a 12 means
                   the isogeny class contains a curve which possesses 
                   a 12-isogeny.

  modular_degree - The modular degree of the optimal quotient of J_0(N).
                   The star means that the curve of minimal Faltings height is not
                   J0-optimal. The plus indicates that the minimal Faltings height curve
                   is a minimal quadratic twist.

  torsion_subgroup - n or nx, where n means Z/nZ and nx means Z/nZ x Z/2Z (only used when n even).

  ord(Delta) - Surrounded in square or round brackets:
                   * square means that Delta is positive and 
                   * round brackets mean that Delta is negative.
               The numbers listed are the valuations of Delta at each prime 
               dividing the level, in order.

  analytic_sha -  analytic order of Sha