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Published online by Cambridge University Press: 26 July 2016
Shapley Constellation III in the north of the LMC is one of the largest associations in the LMC. It is surrounded by a ring of H II regions and diffuse H II filaments called Supergiant Shell LMC 4 (Goudis & Meaburn 1978). LMC 4 is suspected to be a site of large scale propagation of star formation (Dopita et al. 1985), but recent studies (Reid et al. 1987; Vallenari et al. 1993) show that the situation is far from simple.