Fig. 6.
Upper panel: P vs. K − [22] diagram including Tc-rich SRVs (triangles). Different spectral types are colour-coded, see legend. Lower panel: same as upper panel, but showing M-type Tc-poor (downward-pointing blue triangles) and Tc-rich (upward-pointing red triangles) SRVs. Mira stars are shown in both panels as open and filled grey squares.
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