Initial mass to final core mass relation of SN II progenitors. We present the normalized 2D density distribution of the final core mass, M_He, preSN, with the initial mass, M_ZAMS, for all SN II progenitors in case they have an evolution in isolation (left panel) or in case they experience mass exchange with a binary companion (right panel). The color mapping is in logarithmic scale. We also depict the fitting formula for the one-to-one relation of single stars (Eq. (1); white dashed line) and for the median of the initial mass distribution for the case of binary progenitors (Eq. (2); red dashed line).