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source:Source: http://media.afastronomie.fr/RCE/PresentationsRCE2016/J2-S04-5-Pascal%20LE%20DU%20&%20Olivier%20GARDE_Decouvrir%20et%20valider%20par%20spectro%20nouvelle%20n%C3%A9buleuse%20plan%C3%A9taire.pdf