Fig. 13.

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K − [22] vs. P diagram of Miras. Upper panel: Group A, with bumps or asymmetries in the ascending branch of their light curve. Lower panel: Group S, with symmetric light curves. The symbols distinguish the three main spectral types; see the legend. The solid red line is the linear relation given by Eq. (1). Evidently, Miras without bumps have higher K − [22] colours (dust mass-loss rates) than their siblings with bumps at similar pulsation periods.
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