anchor.diff:  %% @todo Implement this function so it only stores `Num' entries in
   %% memory at any given time, instead of as many as there are
   %% processes.
  --spec proc_count(AttributeName, Num) -> [term()] when
  +-spec proc_count(AttributeName, Num) -> [proc_attrs()] when
         AttributeName :: atom(),
         Num :: non_neg_integer().
   proc_count(AttrName, Num) ->
  
positive.code: 
  %% @doc Fetches a given attribute from all processes and returns
  %% the biggest entries, over a sliding time window.
  %% 
  %% This function is particularly useful when processes on the node
  %% are mostly short-lived, usually too short to inspect through other
  %% tools, in order to figure out what kind of processes are eating
  
negative.code: %% Warning: this function depends on data gathered at two snapshots, and then
  %% building a dictionary with entries to differentiate them. This can take a
  %% heavy toll on memory when you have many dozens of thousands of processes.
  -spec proc_window(AttributeName, Num, Milliseconds) -> [proc_attrs()] when
        AttributeName :: atom(),
        Num :: non_neg_integer(),
        Milliseconds :: pos_integer().
  proc_window(AttrName, Num, Time) ->
      Sample = fun() -> recon_lib:proc_attrs(AttrName) end,
      {First,Last} = recon_lib:sample(Time, Sample),
      lists:sublist(lists:usort(
  