anchor.diff:                                           {NodeId + 1 , store_node_to_DOT(Node, Fileid, NodeId, NextFree, TConf)}
                                    end, {NextFreeId, NNFreeId}, Childs),
       {LBr, _LKey, _RKey, RBr} = intervals:get_bounds(I),
  -    io:fwrite(Fileid, "    ~p [label=\"~s~p,~p~s\"""]~n",
  -              [MyId, erlang:atom_to_list(LBr),
  -               ?DOT_SHORTNAME(_LKey), ?DOT_SHORTNAME(_RKey),
  +    io:fwrite(Fileid, "    ~p [label=\"~p\\n~s~p,~p~s\"""]~n",
  +              [MyId, ?DOT_SHORTNAME_HASH(H), erlang:atom_to_list(LBr),
  +               ?DOT_SHORTNAME_KEY(_LKey), ?DOT_SHORTNAME_KEY(_RKey),
                  erlang:atom_to_list(RBr)]),
       NNNFreeId.
   
  
positive.code:     end.
  
  -spec store_node_to_DOT(mt_node(), pid(), pos_integer(), pos_integer(), mt_config()) -> pos_integer().
  store_node_to_DOT({_, C, _, I, []}, Fileid, MyId, NextFreeId, #mt_config{ bucket_size = BuckSize }) ->
      {LBr, _LKey, _RKey, RBr} = intervals:get_bounds(I),
      io:fwrite(Fileid, "    ~p [label=\"~s~p,~p~s ; ~p/~p\", shape=box]~n",
                [MyId, erlang:atom_to_list(LBr),
                 ?DOT_SHORTNAME(_LKey), ?DOT_SHORTNAME(_RKey),
                 erlang:atom_to_list(RBr), C, BuckSize]),
      NextFreeId;
  store_node_to_DOT({_, _, _ , I, [_|RChilds] = Childs}, Fileid, MyId, NextFreeId, TConf) ->
      io:fwrite(Fileid, "    ~p -> { ~p", [MyId, NextFreeId]),
      NNFreeId = lists:foldl(fun(_, Acc) -> 
                                      io:fwrite(Fileid, ";~p", [Acc]),
  
negative.code: %-define(TRACE(X,Y), io:format("~w: [~p] " ++ X ++ "~n", [?MODULE, self()] ++ Y)).
  -define(TRACE(X,Y), ok).
  
  %-define(DOT_SHORTNAME_HASH(X), X). % short node hash in exported merkle tree dot-pictures
  -define(DOT_SHORTNAME_HASH(X), X rem 100000000). % last 8 digits
  
  %-define(DOT_SHORTNAME_KEY(X), X). % short node keys in exported merkle tree dot-pictures
  -define(DOT_SHORTNAME_KEY(X), b).
  
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  % Types
  