Experimental turn-by-turn beam position monitor (BPM) data of an example shot of a kicked beam in the CERN Super Proton Synchrotron from 2018. The set contains data from 4 consecutive BPMs (vertical-horizontal-vertical-horizontal) with about 90 degree phase advance between them (in the respective plane). The vertical beam position data has been rotated to bring the measurement to the location of the first horizontal monitor. Like this, the scaled Poincaré surface of section can be reconstructed.