J − H,Ks − L′ colour–colour diagrams of the Quintuplet outer fields. Proper motion members are shown in green, while non-members are shown in red. The black line denotes the extinction vector (Nishiyama et al. 2009). The red solid line shifted parallel to the reddening vector marks the 3σ selection criterion for L-band excess sources (red diamonds). Wolf-Rayet candidates (Ks< 12 mag) are marked in blue, while fainter excess sources marked as red diamonds are candidates for circumstellar disc emission. The J − H,Ks − L′ diagram of the Quintuplet central field can be found in Fig. 15.
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