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We report trigonometric parallaxes for three massive star-forming regions, corresponding to distances of 2.34 +0.13 −0.11 kpc for G12.89+0.49 (also known as IRAS 18089−1732), 1.98 +0.14 −0.12 kpc for G15.03−0.68 (in the M17 region), and 8.0 +4.0 −2.0 kpc for G27.36−0.16. Both G12.89+0.49 and G15.03−0.68 are located in the Carina–Sagittarius spiral arm.
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Xu et al. (2011) studied this question.
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