Stellar rotation periods determined from simultaneously measured Ca II H&K and Ca II IRT lines

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Fig. 1

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A TIGRE spectrum of the Sun (moon light) of the Ca II IRT lines with the bandpasses chosen for the definition of the S_IRT-indices: the top panel shows the spectral regions used for the S_{IRT_8498}-index, the middle panel those used for the S_{IRT_8542}-index and the bottom panel those used for the S_{IRT_8662}-index.

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