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The Herschel  \subsection{Line of sight ``thickness'' measured by cyano-molecules}  Molecular transitions of cyano-molecules are sensitive to the local volume density. By measuring multiple transition of cyanoacetylene (HC_3N), Avery et al. (1982) and Schloerb et al. (1983) were able to derive a volume density for the TMC-1 region, and thus the line of sight ``thickness'' of the region by comparing to the column density based on 2MASS near-infrared extinction. A similar method is applied to the Taurus B213 filament (Li et al. 2012) with J=2-1 and 10-9 transitions of HC_3N. The result in B213 re-confirm that B213 is a cylindrical filament (Hacar et al. 2013) and has a ``thickness'' of 0.12 pc in the line of sight direction. This result conforms with the width in the plane of sky of \~ 0.1 pc, based on derived from the density profile across the filament (ref?).  N_2H^+  \subsection{Line of sight ``thickness'' measured by Spectral Correlation Function}