A computer program for fast non-LTE analysis of interstellar line spectra - With diagnostic plots to interpret observed line intensity ratiosF. F. S. van der Tak, J. H. Black, F. L. Schöier, D. J. Jansen and E. F. van DishoeckA&A, 468 2 (2007) 627-635DOI: https://doi.org/10.1051/0004-6361:20066820
