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Published online by Cambridge University Press: 13 May 2016
From proplyds to champagne flows, spanning 4 orders of magnitude in size and density, photoevaporation flows are ubiquitous in H II regions. Such flows are also found in planetary nebulae, in the form of cometary knots, although in this case the flows are often “advection-dominated”, unlike the “recombination-dominated” flows that predominate in H II regions.