ng from Optotrak
   
   INPUT
   - filename: name of the file to process (character string)
   - list_markers: list of the marker names
   OUTPUT
   - real_markers: 3D position of experimental markers
   - nb_frame: number of frames
   - Firstframe: number of the first frame
   - Lastframe: number of the last frame
   - f: acquisition frequency
   - list_missing_markers_in_c3d: list of marker name which are missing in
   the c3d file</pre></div>

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<h2><a name="_cross"></a>CROSS-REFERE