Based on observations collected at the European Southern Observatory, Chile, proposal number 69.C-0639.

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Appendices A and B are only available in electronic form at http://www.edpsciences.org

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... JCMT

The James Clerk Maxwell Telescope is operated by The Joint Astronomy Centre on behalf of the Particle Physics and Astronomy Research Council of the UK, the Netherlands Organisation for Scientific Research, and the National Research Council of Canada.

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