An ALMA study of the Orion Integral Filament - I. Evidence for narrow fibers in a massive cloud A. Hacar, M. Tafalla, J. Forbrich, J. Alves, S. Meingast, J. Grossschedl and P. S. Teixeira A&A, 610 (2018) A77 Published online: 07 March 2018 DOI: 10.1051/0004-6361/201731894