Fig. 7
XY view of the Milky Way. The Galactic center is at (0, 0) and the Sun is at (8, 0). The dashed lines indicate the line of sights to cl16.7 and cl49.3, which are marked with squares. A sketch of the spiral structure is also drawn and the arms are labeled (Cordes & Lazio 2002). The X-axis is oriented along the Sun-Galactic center line of sight.
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