anchor.diff:            lacc = [],
             bucket,
             acc_fun,
  -          last
  +          last,
  +          max_delta = 300,
  +          fold_size = 82800
           }).
   
  --define(FOLD_SIZE, 82800).
  --define(MAX_DELTA, 300).
   
   fold_fun(Metric, Time, V,
            Acc =
  
positive.code:                    size = _Size,
                     lacc = AccL,
                     acc_fun = Fun,
                     hacc = AccIn}) when
        _Size > ?FOLD_SIZE ->
      AccOut = Fun({Bucket, Metric}, lists:reverse(AccL), AccIn),
      Size = mmath_bin:length(V),
      Acc#facc{
  
negative.code:              #facc{metric = Metric,
                     size = Size,
                     last = Last,
                     lacc = [{T0, AccE} | AccL],
                    max_delta = _MaxDelta}) when
        (Time - Last) =< _MaxDelta ->
      Delta = Time - Last,
      ThisSize = mmath_bin:length(V),
      AccV = case Delta of
  