anchor.diff:  %% trace analysis
   -export([send_histogram/1]).
   -export([time_delta/1]).
  --export([to_texfile/2]).
  +-export([to_texfile/2, to_texfile_no_time/2]).
   
   %% report tracing events from other modules
   -export([log_send/5]).
  
positive.code:             %% not yet implemented
              DrawTrace
      end,
      draw_messages(File, Nodes, ScaleX, RemainingTrace).
  
  %% Functions used to report tracing events from other modules
  -spec epidemic_reply_msg(passed_state(), anypid(), anypid(), comm:message()) ->
  
negative.code:                end,
                 [], Trace),
      Nodes = lists:reverse(NodesR),
      DrawTrace = DeltaFun(Trace),
  
      EndTime =  element(2, lists:last(DrawTrace)),
  
  