Aims. For many years feedback processes generated by OB-stars in molecular clouds,
including expanding ionization fronts, stellar winds, or UV-radiation, have been proposed to
trigger subsequent star formation. However, hydrodynamic models including radiation and
gravity show that UV-illumination has little or no impact on the global dynamical evolution of
the cloud. Instead, gravitational collapse of filaments and/or merging of filamentary
structures can lead to building up dense high-mass star-forming clumps. However, the …

The paper by Schneider et al.(2012) contains an error in Sect. 2.2 and in Fig. 6. The bottom y-
axis label of Fig. 6 must read “PDF (η)” instead of “log 10 PDF (η)”. The corrected version of
the figure is shown in Fig. 1 here. In Sect. 2.2 of Schneider et al.(2012), the slope fitted to the
high-density tail of the composite PDF, Fig. 6 (here Fig. 1), in Rosette was wrongly quoted to
correspond to a radial volumetric density profile n∝ r-0.65. The value of the slope− 0.65
actually corresponds to the radial column density profile, N∝ r-0.65. Since n∝ N/r, this …