def _get_axis(snapshot_data, column, axis_type):
    """Return column of data from snapshot data of the axis type passed.

    Parameters
    ----------
    snapshot_data : numpy.ndarray
        The data read in holding the axis data of the log.
    column : int
        The column of the desired data in snapshot_data
    axis_type : subclass of Axis
        The type of axis the data is.

    Returns
    -------
    axis_type
    """
    return axis_type(expected=snapshot_data[:, column],
                     actual=snapshot_data[:, column + 1])