Equivalent widths of 9 stars of M 67
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https://b2find.eudat.eu/dataset/a2ba3dc7-3399-5396-a935-b534acdd3a90
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High-resolution spectra of six core helium-burning `clump' stars and three giants in the open cluster M 67 have been obtained with the SOFIN spectrograph on the Nordic Optical...
