Top panel: 4.2′ × 3′ HerschelSPIRE 350 μm image of one SPHerIC survey field. Black contours indicate increasing emission levels at 3,4,5 σ about the RMS noise of the image. Bottom panel: Spitzer/IRAC 3.6 μm image of the same field. Yellow contours indicate the same SPIRE 350 μm emission levels as above. The gain in angular resolution in using IRAC at 3.6 μm is a factor ∼ 15 better than SPIRE at 350 μm. Thus, the IRAC imaging permits the identification of many individual galaxies within the SPIRE beam, as shown.