Fig. 8.

Position of different types of objects in the color-color diagrams N3–L15 vs. N3–S11 (upper), S7–L24 vs. N3–L15 (middle), S7–L24 vs. N3–L24 (lower). (d) AGB candidates are shown as plus signs, (a) post-AGB stars as gray asterisks, (b) Mira stars as gray open triangles, (c) carbon stars as black filled triangles, (e) variable stars as X signs, (f) SRVs as gray open squares, and (g) OSARGs as diamonds.