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Fig. 3

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SOFI J  − H, H  − Ks colour − colour diagram of CG 1 (left panel), the OFF region (middle) and CG 2 (right). The dashed lines show the effect of the Bessell & Brett (1988, BB88) reddening law. The unreddened main sequence given in BB88 is shown with continuous line. A 5m reddening vector has also been included in the diagram. The average formal error of a data point is indicated in the lower right of the left panel. The discovered IR excess stars have been marked. The cross shows CG 1 IRS 3, which is not included in the final photometry catalogue.

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