meillo@126: \begin{verbatim}
meillo@126: |            |             |          |    *******  |          |
meillo@126: |            |             |          |*#**       **|  telefax |
meillo@126: |            |             |      ***** email       ***#**     |
meillo@126: |            |             |    **    |             |     *****|
meillo@126: |            |             |*#**      |             |          |
meillo@126: |            |           *** IM       |             |          |
meillo@126: |            |         **  |          |             |          |
meillo@126: |            |      *#*    |          |             |          |
meillo@126: |            |    ** VoIP  |          |             |          |
meillo@126: |            |  **         |          |             |          |
meillo@126: |        voice *           |          |             |          |
meillo@126: | video  mail**            |          |             |          |
meillo@126: | mess.   #**|             |          |             |          |
meillo@126: |    #****   |             |          |             |          |
meillo@126: |****        |             |          |             |          |
meillo@126: ----------------------------------------------------------------
meillo@126: |            |             |          |             |          |
meillo@126: | introduct. | growth      | mature   | saturation  | decline  |
meillo@126: \end{verbatim}