._______.______  .... ......_______ ___     .........._______
    l_ _    |_ _   |.:   :     :. _    |   |   .:        :.__    |
    |  _____j  |___j·.  ...    .· _____j   |___·.   :.   .· |    |
    |  l    |  |     :   :     :  l    |   l    :    ·   :  |    |
    |___    |________:...:     :___    |___     :...     :__|    | dtn
-------l____j-/\-------- ······· -l____j--\_____j----- ··· -l____j--- .
             /   e   c   h   e   l   o   n     2  o  o  1             ·
------------/-------------------------------------------------------- + - -
          \/                                                          :
                                                                      .