The evolutionary state of Miras with changing pulsation periods

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Fig. 3

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Spectra of three sample stars around the Tc line at 423.819 nm. From top to bottom: T UMi, R Hya, and S Her. The spectra of T UMi and R Hya have been shifted upwards by 1.2 and 0.6 to make the plot clearer. The wavelength of the Tc line is marked with a dotted vertical line.

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