...atlas

Figures 1-3 are only available in electronic form at the http://www.edpsciences.com

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...supergiants

Based on observations made with the INT and JKT telescopes operated on the island of La Palma by the RGO in the Spanish Observatorio del Roque de Los Muchachos of the Instituto de Astrofisica de Canarias, with the 2.2 m telescope at Calar Alto Observatory, Spain, with the Bernard Lyot 2 m telescope at Pic Du Midi Observatory, France and observations collected at the European Southern Observatory at La Silla, Chile.

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...MIDAS

Munich Image Data Analysis System, European Southern Observatory.

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...IRAF

Image Reduction and Analysis Facility, National Optical Astronomy Observatories.

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