Efficiency of the three online triggers ($2$-out-of-$3$, V0AND, $3$-out-of-$3$) used for Pb-Pb collisions as a function of the VZERO amplitude calculated with HIJING and AMPT, and measured in dedicated pp runs. The efficiency in the simulation has been calculated for events with $\Npart=2$. | ![](https://alice-publications.web.cern.ch/sites/default/files/papers/484/trigEffi-2723.png ) |