Each technical sheet, i.e. frequency tuning, can be connected to several sources in PMS. In case that sources, sharing the same tuning, are located reasonably close to each other in the sky and need reasonably short integration times, PMS allows the PI to specify a track-sharing mode (please check the track-sharing box in the technical sheet in PMS), which will result in a lower overall telescope time due to reduced overheads. Please note that PMS will issue a warning should the maximum distance between the track-shared sources exceed the recommended 15 degrees and/or should the number of track-shared sources be larger than 15. These limitations have been chosen, among other reasons, to allow for gain calibrators that can still be reasonably close to all sources, and to reduce observing overheads due to slewing and calibration needs. The feasibility of track-sharing is, however, not guaranteed even if no warning is given by PMS. In particular, Doppler tracking will be done by default on the mean LSR velocity of the targets (requests for other tracking modes should be justified). Users should check that the spectral lines of the two targets with the highest velocity difference to the mean velocity will not move out of the selected frequency range, which is especially important with respect to the frequency coverage of selected high spectral resolution chunks. Therefore, special care has to be applied when configuring the spectral setup.