# Figure 42

 Pion efficiency as a function of electron efficiency (left,for 6~detector layers) and as a function of the number of detector layers (right, for 90\%electron efficiency) for the various eID methods The results are compared for the momentum interval 0.9--1.1\gevc in \ppb collisions at \sqrtsnn~=~5.02~TeV. The results of the truncated mean method are only shown for a minimum of 4~tracklets, where the resolution is better than 18\% (see Fig.~\ref{Figure_truncmeanres}).