Same as Fig. 9 but for WISE1–WISE2/WISE2–WISE3, IRAC1–IRAC2/IRAC2–IRAC3, J–WISE1/J–IRAC4 and K_S –WISE3/WISE3–WISE4. A group of targets (∼15%, upper leftregion covered by the dashed lines) with probable PAH feature show redder color in IRAC2–IRAC3 and even bluer color in IRAC1–IRAC2 than the others in the IRAC1–IRAC2/IRAC2–IRAC3 diagram. The dashed line (WISE3–WISE4 ≈ 1:3 mag) in the K_S –WISE3/WISE3–WISE4 diagram indicates the color where F_μ(WISE4) = F_μ = (WISE3).