Fig. 1
Mira stars of a different atmospheric chemistry (spectral type) in the (K − [22]) vs. P diagram. Empty symbols are for Tc-poor stars, filled symbols are for Tc-rich stars. The dashed line indicates the run of the mean (K − [22]) colour in 50 d period bins for the Tc-poor stars, while the solid line shows this run for the Tc-rich stars.
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