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tokens: full parameter space are shown in Table 1 , describing both the prospects per field and averaged over all Galactic Plane fields tested. Figure 4. Colour maps displaying the period determination of LMXBs possible in LSST field 630 with observing strategies astro_lsst_01_1004 , Minion_1020 , baseline2018a , and Minion_1016 . The y -axis denotes the orbital period in days, and the x -axis denotes the reddened r magnitude before adding contributions from ellipsoidal modulation, flaring, and noise. The colour denotes the significance of the period detected. If the measured period differed from the actual period by more than 5 per cent, then the significance was set to zero. The graph shows a bimodality in the significances of period determination, as recovered periods that had low significance were often incorrect and manually set to zero. Table 1. The fraction of the simulated parameter space for which P orb was correctly recovered for each observing strategy, both for the individual LSST fields and the total, combined over all three Galactic Plane fields. The initials denote which cadence was used for that field; South Celestial Pole (SCP), Galactic Plane (GP), or Wide-Fast-Deep (WFD). The reddening is listed in magnitudes. The reddening and coordinates refer to the centre of the field. The P orb recovery is worst for the baseline2018a observing strategy, as it only correctly recovers 0.23 of the simulated parameter space. This is to be expected as although it has a similar number of observations per field as Minion_1016 , a 25 per cent segment of the observations corresponding to potential outburst durations was removed from the full survey lifetime. Therefore, it offered the fewest usable observations per Galactic Plane field of any strategy. This is then followed by Minion_1016 that correctly recovers 0.46 of the parameter space, the low fraction is again due to the relatively small number of Galactic Plane observations per field. The two strategies that performed best were Minion_1020 and astro_lsst_01_1004 that correctly recovered P orb for 0.70 and 0.69 of the simulated magnitude- P orb parameter space (respectively), averaged over the Galactic Plane fields. The vast majority of the incorrectly recovered periods for both strategies had no observations in LSST’s visible magnitude range, within that region of parameter space. In these regions, there is no potential for good recovery of P orb , regardless of the number of observations. In order to evaluate the relation between Galactic reddening and period determination, the P orb recovery and reddening were plotted against both magnitude and P orb . In order to construct the magnitude-reddening graph, the significance of the P orb recovery was first averaged over all 20 periods for each region of parameter space with a distinct magnitude, field, and strategy. This average P orb recovery significance per magnitude was then plotted against Galactic extinction. Each significance-extinction