Cumulative distribution function of the ratio between the mass of the cell where the SNe injected explosion energy and the total swept-up mass at end of the energy conserving Sedov-Taylor phase (shell formation) given by equation (12). The red and green curves are the 1 M_⊙ resolution results obtained with the fiducial RIGEL model, while the blue curve is obtained without radiative feedback (see Section 3 for the naming conventions). The dotted curves are the results of the 10 M_⊙ resolution simulations. The vertical dashed line denotes the ST-resolving criterion of m_gas, SN / M_shell < 1/27 by Kim & Ostriker (2015).