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Fig. 8

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The three-dimensional sketch of the massive star-forming region NGC 7538-IRS 1 as described in Sect. 4.4. The two cones are the red- and blue-shifted part of the large-scale molecular bipolar outflow (Kameya et al. 1989), the donut is the torus suggested by Klaassen et al. (2009) perpendicular to the outflow and with i = 32° (De Buizer & Minier 2005), the triangles, the circles, and the boxes are the CH3OH, H2O masers (present paper), and the OH masers (Hutawarakorn and Cohen 2003), respectively. The outflow and the torus are transparent to allow the reader to see behind them.

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