Fig. 5.

The average number of a pixel clusters identified as merged and b shared pixel clusters on primary tracks (with a production vertex before the IBL) are shown as a function of the angular distance of the track from the jet axis. Data (markers) and dijet MC (lines) samples are compared in bins of jet $p_{\text{T}}$. The rise in both populations at small distances from the jet axis is expected due to the increasingly dense environment. a Pixel clusters identified as merged. b Shared pixel clusters