def phi31_v_from_i_deb(phi31_i):
    """
    Calculates the V band phi31 for the given I band phi3 using the
    relationship found in Deb and Singh (2010).

    (Deb and Singh, 2010) (Table 3)
    (Skowron et al., 2016) (4)

    Parameters
    ----------
    phi31_i : float64
        The I band phi31 of the star.

    Returns
    -------
    phi31_v : float64
        The calculated V band phi31 of the star.
    """
    return 0.568 * phi31_i + 0.436