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\section{Introduction}
In recent years the focus of much star formation research has been on the relationship between the immediate star formation environment and the evolution of protostars. The data from the last generation of orbiting observatories has invigorated work toward understanding the formation of filamentary structures in molecular clouds, and the condensation of dense star forming cores form these filaments.
Recently \citet{2013A&A...554A..55H} presented observations of a prominent filamentary feature in Taurus, dominated by the L1495 cloud \citep{1962ApJS....7....1L} and the
B213 several dark
patch patches \citep{1927cdos.book.....B}.
Hacar et al. observed the region in the moderate density tracer C$^{18}$O, obtaining spectra along the $\sim 10$ pc length of the region. Analysing the filament in the resultant position--position--velocity space, they found the intriguing result that the gas along the ridge is organized in velocity-coherent filamentary structures, each with typical length $\sim0.5$ pc. Each filament is internally subsonic, though the collection of filaments is characterised by a mildly supersonic interfilamentary dispersion of $\sim 0.5$ km s$^{-1}$.
Multiple velocity components along a single line of sight have also been observed in Serpens South \citep{2013ApJ...778...34T}; this feature may be common one in young star forming sites.