Number of mass-ejection events caused by pair instability as a function of CO core mass. The color shading indicates the approximate range for each behavior: core collapse without experiencing PPI-driven mass loss (CC, blue), PPI-driven mass loss (PPI+CC, green), or full disruption in a PISN (yellow), which we define as one mass loss event. The noisiness is caused by the occurrence of mass loss event right at the time of the final core collapse.