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We present an atlas composed of more than 1500 spectra of late-type stars(spectral types from G to M) observed simultaneously in the optical and calciumtriplet spectral ranges. These spectra were obtained as part of a survey tosearch for cool supergiants in the Magellanic Clouds and were taken over fourepochs. We provide the spectral and luminosity classification for each spectrum(71% are supergiants, 13% are giants or luminous giants, 4% are carbon or Sstars, and the remaining 12% are foreground stars of lesser luminosities). Wealso provide a detailed guide for the spectral classification of luminouslate-type stars, the result of the extensive classification work done for theatlas. Although this guide is based on classical criteria, we have put themtogether and re-elaborated them for modern CCD-spectra as these criteria werescattered among many different works and mainly conceived for use withphotographic plate spectra. The result is a systematic, well-tested process foridentifying and classifying luminous late-type stars, illustrated with CCDspectra of standard stars and the classifications of our own catalogue.

An atlas of cool supergiants from the Magellanic Clouds and typical interlopers. A guide for the classification of luminous red stars