@staticmethod
def G_factor(HV, HH):
    """
        Compute G-factor to correct for differences in transmittion effiency of the horizontal and vertical polarized light

        Parameters
        ----------
        HV : ndarray
             horizontal excitation - vertical emission
        HH : ndarray
             horizontal excitation - horizontal emission
        Returns
        -------
        G : float
            G-factor 

        Notes
        -----
        The G-factor is defined as follows:

        .. math::
            G = \\frac{\\int HV}{\\int HH}
        """
    G = sum(HV) / sum(HH)
    return G
