Longitudinal mass profiles of Ophiuchus’s densest R-type filaments (B44 and L1709 at B45’s head) at Herschel’s higher resolution. As in the lower-resolution Planck-based profile in Figure 6, the linear mass density decreases from the head, closest to the massive stars, toward the tail. Class I protostars, tracers of ongoing star formation, are shown as red stars and associated with the maxima of the profile.