Trigonometric parallaxes of star-forming regions in the Sagittarius spiral arm Y. W. Wu, M. Sato, M. J. Reid, L. Moscadelli, B. Zhang, Y. Xu, A. Brunthaler, K. M. Menten, T. M. Dame and X. W. Zheng A&A, 566 (2014) A17 Published online: 02 June 2014 DOI: 10.1051/0004-6361/201322765