def calcReflectivities(_ranges, _intensities):
    """Calculate reflectivites from ranges and intensities.

    Parameters
    ----------
    _ranges : list
        ranges from LIDAR
    _intensities : list
        intensities from LIDAR

    Returns
    -------
    list
        reflectivities
    """

    reflectivities_ = list([])
    for i in range(len(_ranges)):
        rang = _ranges[i]
        inte = _intensities[i]

        # how to get reflectivity
        refl = rang * inte ** 2 / 10000

        reflectivities_.append(refl)
    return reflectivities_