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1 Supplemental Material: Annu. Rev. Astron. Astrophys : High-Mass Star and Massive Cluster Formation in the Milky Way Motte, Bontemps, Louvet Supplemental Figure 1 (see Table 3), Cygnus X was imaged by the Herschel/HOBYS key program ( 2010). MDC, massive dense core. Adapted from Hennemann et al. (2012) and Schneider et al. (2016) with permission.

2 Supplemental Figure 2 (see Table 3), Rosette was imaged by the Herschel/HOBYS key program ( 2010). MDC, massive dense core. Adapted from (2010) and Schneider et al. (2010) with permission ẇww.annualreviews.org High-mass star and massive cluster formation in the Milky Way

3 Supplemental Figure 3 (see Table 3), M16/M17 was imaged by the Herschel/HOBYS key program ( 2010). MDC, massive dense core. Adapted from Hill et al. (2012) with permission.

4 Supplemental Figure 4 (see Table 3), NGC was imaged by the Herschel/HOBYS key program ( 2010). Composite three-color Herschel image with red = 250 µm, green = 160 µm, and blue = 70 µm. Blue di use emission corresponds to photo-dissociation regions around massive stars or clusters. Earlier stage star-forming sites are themselves seen as red filaments and orange MDCs. Abbreviation: MDC, massive dense core. Adapted from Russeil et al. (2013) with permission. High-mass star and massive cluster formation in the Milky Way

5 Supplemental Figure 5 (see Table 3), Vulpecula was imaged the Herschel/Hi-GAL key program (Molinari et al. 2010). MDC, massive dense core. Adapted from Billot et al. (2010) with permission.

6 Supplemental Figure 6 (see Table 3), G345 was imaged the Herschel /Hi-GAL key program (Molinari et al. 2010). MDC, massive dense core. Adapted from Molinari et al. (2016) with permission. High-mass star and massive cluster formation in the Milky Way

7 Supplemental Figure 7 (see Table 3), W3/KR140 was imaged by the Herschel /HOBYS key program ( 2010). MDC, massive dense core. Adapted from Rivera-Ingraham et al. (2013) with permission.

8 Supplemental Figure 8 (see Table 3), Carina was imaged by Herschel. Composite three-color Herschel image with red = 250 µm, green = 160 µm, and blue = 70 µm. Blue di use emission corresponds to photo-dissociation regions around massive stars or clusters. Earlier stage star-forming sites are themselves seen as red filaments and orange MDCs. Abbreviation: MDC, massive dense core. Adapted from Preibisch et al. (2012) and Gaczkowski et al. (2013) with permission. High-mass star and massive cluster formation in the Milky Way

9 Supplemental Figure 9 (see Table 3), NGC 7538 was imaged by the Herschel/HOBYS key program ( 2010). MDC, massive dense core. Adapted from Fallscheer et al. (2013) with permission.

10 Supplemental Figure 10 (see Table 3), W48 was imaged by the Herschel/HOBYS key program ( 2010). MDC, massive dense core. Adapted from Nguy ê n L u o ng et al. (2011a) and Rygl et al. (2014) with permission. High-mass star and massive cluster formation in the Milky Way

11 Supplemental Figure 11 The reference molecular cloud complex Orion was imaged by the Herschel/HGBS key program (André et al. 2010). Composite three-color Herschel image with red = 250 µm, green = 160 µm, and blue = 70 µm. Adapted from Polychroni et al. (2013) with permission.

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