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  Among the most useful of the special extended ASCII characters are the
  characters designed for drawing single- and double-lined boxes: characters
  B3H through DAH (decimal 179 through 218). Because they are difficult to
  combine properly, you may find the information in Figure C-6 helpful.

  +-----------------------------------------------------------------+
  |    218  196  194       191     |    201  205  203       187     |
  |     +    -    -         +      |     +    -    -         +      |
  |                                |                                |
  |  179|                          |  186|                          |
  |                                |                                |
  |  195|         +         |180   |  204|         +         |185   |
  |              197               |              206               |
  |                                |                                |
  |                                |                                |
  |     +         -         +      |     +         -         +      |
  |    192       193       217     |    200       202       188     |
  |--------------------------------+--------------------------------|
  |    213       209       184     |    214       210       183     |
  |     +         -         +      |     +         -         +      |
  |                                |                                |
  |                                |                                |
  |                                |                                |
  |  198-         +         |181   |  199-         +         |182   |
  |              216               |              215               |
  |                                |                                |
  |                                |                                |
  |     +         -         +      |     +         -         +      |
  |    212       207       190     |    211       208       189     |
  +-----------------------------------------------------------------+

  Figure C-6.  The box-drawing characters and their corresponding ASCII
  codes.