def tetrode_chans(tetrode_num):
    """ Return the channel numbers for the requested tetrode.

    .. warning::
        These channels are only valid for the H04 and H05 adapters used in our
        lab.

    **Arguments**:
        *tetrode_num*:
         Tetrode number.

    **Returns**:
        A list of channels belonging to the chosen tetrode.

    """

    tetrodes = {1:[16,18,17,20], 2:[19,22,21,24], 3:[23,26,25,28],
                4:[27,30,29,32]}

    return tetrodes[tetrode_num]