anchor.diff:      %% check 2s & 3s < 4s
       Ms = timer:now_diff(now(),?config(t0,Config)),
       test_server:comment(io_lib:format("~p",[now()])),
  -    if Ms > 3500000 -> exit({bad_parallel_exec,Ms});
  +    if Ms > 4000000 -> exit({bad_parallel_exec,Ms});
          Ms < 3000000 -> exit({bad_parallel_exec,Ms});
          true -> ok
       end.
  
positive.code:     %% check 3s & 2s < 4s
      Ms = timer:now_diff(now(),?config(t0,Config)),
      test_server:comment(io_lib:format("~p",[now()])),
      if Ms > 3500000 -> exit({bad_parallel_exec,Ms});
         Ms < 3000000 -> exit({bad_parallel_exec,Ms});
         true -> ok
      end.
  
negative.code:     %% check 2s & 3s >= 5s
      Ms = timer:now_diff(now(),?config(t0,Config)),
      test_server:comment(io_lib:format("~p",[now()])),
      if Ms > 6000000 -> exit({bad_parallel_exec,Ms});
         Ms < 5000000 -> exit({bad_parallel_exec,Ms});
         true -> ok
      end.
  