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Fig. 6

image

Comparison of the 800-nm region of three RGB stars in this library; from top to bottom, Arcturus (α Boo, K1.5III), Hamal (α Ari, K1IIIb), Rasalas (μ Leo, K2III). The region contains many 12CN and 13 CN lines from which the 12C to 13 C ratio is derived. A telluric spectrum scaled to the Rasalas observation is shown on the top.

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