anchor.diff:                      orddict:new()
               end,
   
  -            %% Update dictionary `TimeToLogs0` adding new pair log to 
  +            %% Update dictionary `TimeToLogs0` adding new pair log to
               %% the list of logs mapped to time `TimeF`
               TimeToLogs1 = orddict:append(TimeF, {BytesF, Type}, TimeToLogs0),
   
  
positive.code: %% - Receives:
  %%   * set of known types
  %%   * set of known times
  %%   * a dictionary that maps nodes to dictionaries 
  %%     (from times to pairs {bytes, type})
  %% - Produces a dictionary that maps types to a list of 
  %%   pairs {time, bytes}
  average(Types, Times, Map) ->
      Empty = create_empty_dict_type_to_time_and_bytes(Types, Times),
  
negative.code:     end.
  
  %% @private
  %% If in the logs of one node, we don't find some reference to some
  %% time, for every type of log, assume the last known value
  assume_unknown_logs(Types, Times, Map) ->
      orddict:fold(
  