Herbig-Haro jets and their probable sources as seen in four different wavelengths. From left to right: Hubble Space Telescope RGB image (red: WFPC2 S II filter (673 nm), green: ACS Hα +N II filter (658 nm), blue: WFPC2 O III filter (502 nm); image credit: NASA/ESA/Hubble Heritage Team (STScI/AURA)), Spitzer IRAC RGB image with 3.6 μm in blue, 4.5 μm in green, and 8.0 μm in red, Herschel PACS 170 μm image, and VISTA H-band image. The yellow or blue arrows indicate the broad shape and direction of the outflow in question, white letters mark their features as described by Smith et al. (2010a). The candidate infrared-identified sources are marked at their Spitzer coordinates with circles in yellow or blue.