Colour–magnitude diagrams  versus − and K versus J − K for respectively the remaining Galactic and Magellanic objects sample selected after cut #3. The selection areas of cut #4 and cut #5 are delimited with red lines. All known and candidate RCB stars are indicated also as a reference sample. The area where Magellanic extreme AGB stars were selected to be represented in Fig. 2 is indicated in orange. See discussion in Sect. 2.2.1, cut #4 and cut #5 for more details. The interstellar (I) and circumstellar (C) reddening effect are indicated with arrows.
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