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\section{Filament selection and analysis}  We selected by eye three filamentary features in one projection of the cloud's surface density at about X Myr after the beginning of the collapse simulation. We selected a rectangular region around each of these filaments (see figure   X). We then stepped along the length $L$ and width $W$ of the filaments with step sizes corresponding to the minimum resolution of the simulation. At each location in the filament boxes we calculated the density-weighted line-of-sight velocity along the projection axis. This velocity spectrum was binned into a histogram with bin width 0.075 km s$^{-1}$, a width chosen to roughly match the velocity resolution of H12.