anchor.diff:  -type time()         :: erlang_timestamp() | non_neg_integer().
   -type logger()       :: io_format                       %% | ctpal
                         | {log_collector, comm:mypid()}.
  --type pidinfo()      :: {comm:mypid(), 
  +-type pidinfo()      :: {comm:mypid(),
                            {pid_groups:groupname(), pid_groups:pidname()} |
  -                             no_pid_name | 
  +                             no_pid_name |
                                non_local_pid_name_unknown}.
   -type anypid()       :: pid() | comm:mypid() | pidinfo().
   -type trace_id()     :: atom().
  
positive.code: % @copyright 2012 Zuse Institute Berlin
  
  %   Licensed under the Apache License, Version 2.0 (the "License");
  %   you may not use this file except in compliance with the License.
  
negative.code:                   io:format(File,
                              "\\draw[color=gray,very thin] (0, -~p) -- (~pcm, -~p);~n",
                              [length(Acc)/2, (EndTime+10)/ScaleX, length(Acc)/2]),
                    case EndTime > 600 of
                        true ->
                            io:format(File,
                                      "\\foreach \\x in {~p,~p,...,~p}~n"
                                      "  \\node[anchor=south east,gray,inner sep=0pt] at (\\x, -~p) {\\tiny ~s};~n",
                                      [300 div ScaleX, 600 div ScaleX,
                                       ((trunc((EndTime+10)) div 300) * 300) div ScaleX,
                                       length(Acc)/2, LatexNode]);
                        false -> ok
                    end,
                    [X | Acc]
            end,
            [], Nodes),
  