Distribution of the interstellar UV radiation field estimated from the dust continuum emission from Herschel under the assumption that all UV radiation from nearby stars was absorbed and re-emitted in the far-IR. The G₀ values presented here are likely overestimated due to contribution from thermal dust emission to the FIR continuum. Orange circles mark the location of the protostars, while red stars mark the position of the massive stars S1 and HD147899. α-Sco, σ-Sco, and ρ-Oph are located outside the FoV of this figure (similar to Fig. 1).