The three multiplicity algorithms are compared, after full correction, (left) without and (right) with fiducial cuts in azimuthal angles. Ratios of ${\rm d}\nch$/${\rm d}\eta$ measurements with different algorithms are shown: ITSTPC$+$ over Tracklet (black circles) and ITS$+$ over Tracklet (red squares). | ![](https://alice-publications.web.cern.ch/sites/default/files/papers/1885/azimuthal-cut-effect-dndeta-23357.png ) |