**STEP n°4:** assemble Ohmpi 
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.. table::
   :align: center
   
   +--------+------------------------------------------------------------+
   |        |   .. image:: step_n_4/step_4_1.jpg                         |
   |      1 +------------------------------------------------------------+
   |        |Cut 4 ribbon cables composed of 16 wires each to the proper | 
   |        |length (about 1.5m). Each wire corresponds to an electrode. |                                                                      
   +--------+------------------------------------------------------------+

.. table::
   :align: center

   +--------+------------------------------------------------------------+
   |        |   .. image:: step_n_4/step_4_2.jpg                         |
   |      1 +------------------------------------------------------------+
   |        |Crimp the ribbon cable on the corresponding idc connector   | 
   |        |with a suitable clamp. Pay attention to the direction of the|                                                                      
   |        |cables. Unbalanced IDC connector. The ribbon cable must be  | 
   |        |perpendicular to the connector.                             |
   +--------+------------------------------------------------------------+