Mapping the Milky Way bulge at high resolution: the 3D dust extinction, CO, and X factor maps M. Schultheis, B. Q. Chen, B. W. Jiang, O. A. Gonzalez, R. Enokiya, Y. Fukui, K. Torii, M. Rejkuba and D. Minniti A&A, 566 (2014) A120 Published online: 23 June 2014 DOI: 10.1051/0004-6361/201322788