Spatially extended OH+ emission from the Orion Bar and RidgeF. F. S. van der Tak, Z. Nagy, V. Ossenkopf, Z. Makai, J. H. Black, A. Faure, M. Gerin and E. A. BerginA&A, 560 (2013) A95DOI: https://doi.org/10.1051/0004-6361/201322164