Chemical stratification in the Orion Bar: JCMT Spectral Legacy Survey observations M. H. D. van der Wiel, F. F. S. van der Tak, V. Ossenkopf, M. Spaans, H. Roberts, G. A. Fuller and R. Plume A&A, 498 1 (2009) 161-165 Published online: 18 February 2009 DOI: 10.1051/0004-6361/200811391