Top: MSX band A (8 μm; left) and band E (20 μm; right) images of G23.3–0.3. The square indicates the area displayed in the composite image at the bottom. Bottom: false-color composite image of the G23.3–0.3 complex, which was created with GLIMPSE data: 3.6 μm (blue), 4.5 μm (green), and 8.0 μm (red). Contours of the 20 cm emission detected by MAGPIS (White et al. 2005; Helfand et al. 2006) at 0.002, 0.003, 0.004 Jy beam^-1 levels are super-imposed. Galactic longitude is along the x-axis, and Galactic latitude is along the y-axis.