A proposed new diagnostic for Herbig disc geometry - FWHM versus J of CO ro-vibrational lines R. P. Hein Bertelsen, I. Kamp, G. van der Plas, M. E. van den Ancker, L. B. F. M. Waters, W.-F. Thi and P. Woitke A&A, 590 (2016) A98 Published online: 23 May 2016 DOI: 10.1051/0004-6361/201527652