Fig. 7.
Position of different types of objects in the color-color diagrams S11–L15 vs. N3–S11 (upper), S7–L24 vs. N3–L15 (middle), S7–L24 vs. N3–L24 (lower). AGB stars are shown as small gray filled circles, other late-type pulsating giants as gray plus signs, post-AGB stars as asterisks, multiple stellar systems as gray open triangles, YSOs as gray diamonds, background objects as black open squares, and foreground objects as black filled triangles.