Spitzer/IRAC three-colour composite image at 8, 4.5, and 3.6 μm in red, green, and blue, respectively, of the star forming region G9.62. Red contours maps the Spitzer/IRAC observations of PAH at 8 μm. The contours level are linearly from (0.1–0.9) × 2550 mJy sr⁻¹. The dark blue dots indicate the position of the more evolved source A, B, and C. The orange dots denote the positions of the massive young stellar objects denoted by the letters from D to I. Yellow contours track the continuum emission from 860 μm SMA observations of the G9.62 clump (Liu et al. 2011). The contours are drawn from 0.03 Jy beam⁻¹ and rising in steps of 0.12 Jy beam⁻¹. The noise level is 0.01 Jy beam⁻¹ (Liu et al. 2011).