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Figure 54

Rejection by the level-1 trigger for requiring 1--4 tracks in any stack ($N_{\rm trk}$) above varying \pt thresholds for pp collisions at \sqrts~=~8~TeV~. The error bars indicate the statistical uncertainties. The distributions were obtained by counting the number of tracks in a stack above a given threshold and normalised by the number of sampled events.
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