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Fig. A.1


Proper motion diagrams of the Quintuplet fields beyond the cluster centre. L-band excess sources are marked as red diamonds, while Wolf-Rayet candidates are shown in blue. The criterion for cluster member selection (circle) depends on the astrometric quality of each data set and on the corresponding dispersion in the cluster population around the origin. For the outer Quintuplet fields exclusively, membership probabilities were used to distinguish cluster members from field stars. The indicated membership criterion is therefore approximate, as the probabilities account for individual astrometric uncertainties and the location of each star with respect to the cluster centre. See Fig. 7 for further details.

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