Fig. (4) Regions of the effective Majorana neutrino mass m_{β β} allowed by the neutrino oscillation experiments, depending on the assumed values of the smallest neutrino mass m_min = min (m_i), m_tot = and < m_β > = m_ve defined in Eq. 5. The blue horizontally-hatched band corresponds to NH, the slant red one to IH. The width of these bands reflects the uncertainty due to the unknown phases φ(k) in Eq. 2. Wider bands restricted by solid lines (in red for NH and in black for IH) include the experimental uncertainties of the oscillation parameters. The systematic uncertainties of the nuclear matrix elements are not included. This figure is reproduced from [41].