LH-SBC3 selected following the method in Sect. 2.2. Left: smoothed Σ₁₀ map of the red IRAC priors (Eq. (1)) over the 25′×25′ area around LH-SBC3. The construction of the map is described in Sect. 2.2.1. The inserted histogram is the distribution of Σ₁₀ (black histogram) and the Gaussian fit (red dashed curve). The red arrow indicates the peak Σ₁₀ value of LH-SBC3. Right: Herschel/SPIRE composite color image of the same area. The R, G, and B channels correspond to 500 μm, 350 μm, and 250 μm, respectively. The white circles in both figures have a radius of 2′.