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