Related paper Production of $π^0$ and $η$ mesons up to high transverse momentum in pp collisions at 2.76 TeV Efficiency bias $K_{\rm Trig}$ induced by different triggers (EMC1, EMC7 and EG1) for neutral pions (left panel) and $\eta$ mesons (right panel) for $\rm{PCM-EMC}$ (open symbols) and $\rm EMC$ (closed symbols).[png] [eps][png] [eps]