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Published online by Cambridge University Press: 19 July 2016
The main purpose of our work is to study the range of ages of the stars in an area about 40' in diameter around R 136. Apart from individual stellar spectra, other age criteria may be found in photometric studies, the morphology and the density of the associated gas. In such complex regions as the 30 Dor region, estimating the depth along the line of sight is a problem.