Observational test of the CH cation oscillator strengths T. Weselak, G. A. Galazutdinov, F. A. Musaev, Y. Beletsky and J. Krełowski A&A, 495 1 (2009) 189-194 Published online: 14 January 2009 DOI: 10.1051/0004-6361:200810348