A possible observational bias in the estimation of the virial parameter in virialized clumps A. Traficante, Y.-N. Lee, P. Hennebelle, S. Molinari, J. Kauffmann and T. Pillai A&A, 619 (2018) L7 Published online: 20 November 2018 DOI: 10.1051/0004-6361/201833513