def mass1_from_tau0_tau3(tau0, tau3, f_lower):
    r"""Returns the primary mass from the given :math:`\tau_0, \tau_3`."""
    mtotal = mtotal_from_tau0_tau3(tau0, tau3, f_lower)
    eta = eta_from_tau0_tau3(tau0, tau3, f_lower)
    return mass1_from_mtotal_eta(mtotal, eta)
def mass1_from_tau0_tau3 ( tau0 , tau3 , f_lower ) : mtotal = mtotal_from_tau0_tau3 ( tau0 , tau3 , f_lower ) eta = eta_from_tau0_tau3 ( tau0 , tau3 , f_lower ) return mass1_from_mtotal_eta ( mtotal , eta )
r"""Returns the primary mass from the given :math:`\tau_0, \tau_3`.