anchor.diff:           fprob, 5, 2, 0, Options),
       ok.
   
  --spec art_scale(N::pos_integer(), EvalRepeats::pos_integer(),
  -                MBranch::pos_integer(), MBucket::pos_integer(),
  -                ACorrFactor::non_neg_integer()) -> ok.
  -art_scale(N, EvalRepeats, MBranch, MBucket, ACorrFactor) ->
  -    {Dir, FileName} = default_dir_and_name(art),
  -    art_scale(Dir, FileName, N, EvalRepeats, MBranch, MBucket, ACorrFactor).
  -
   -spec art_scale(DestDir::string(), FileName::string(), N::pos_integer(),
                   EvalRepeats::pos_integer(), MBranch::pos_integer(),
                   MBucket::pos_integer(), ACorrFactor::non_neg_integer()) -> ok.
  
positive.code: %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  
  -spec eval(Mode::pair | sys,
             [ring_setup()],
             StepP::step_param(),
             StepCount::pos_integer(),
             StepSize::step_size() | power,
  
negative.code: %% ART EVAL
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  
  -spec art(DestDir::string(), FileName::string(), N::pos_integer(),
            EvalRepeats::pos_integer(), MBranch::pos_integer(),
            MBucket::pos_integer(), ACorrFactor::non_neg_integer()) -> ok.
  