Searching for the in-plane Galactic bar and ring in DENIS M. López-Corredoira, P. L. Hammersley, F. Garzón, A. Cabrera-Lavers, N. Castro-Rodríguez, M. Schultheis and T. J. Mahoney A&A, 373 1 (2001) 139-152 Published online: 15 July 2001 DOI: 10.1051/0004-6361:20010560