Difference between HC₃N (10−9) line emission and NH₃ (1,1) line emission central velocities in both filaments of Barnard 5. Left: spatial map showing the difference of HC₃N(10 − 9) central velocities with respect to NH₃ (1,1) velocities. Black thick contours mark the positions where the difference is 0. The resolution of the HC₃N (10−9) data is on the lower left corner. The dotted contours show the filaments and the black solid contours outline the condensations as defined in P15 and S21. Right: versus Distribution of the velocity difference shown using its KDE. The dashed vertical line represents the 1:1 line, and the solid line is shifted by −0.08, which is the median value of the difference between both velocities.