Velocity channel maps of the H₂CO 3(0, 3)−2(0, 2) line emission above 3 rms (rms ∼ 1.53 Jy beam⁻¹ m s⁻¹) toward the I19368 region. The red dashed contours in each box are the same as in Figure 2, depicting the filament morphology. The corresponding LSR velocity of each channel map is displayed in the top right of each panel. The synthesized beam of 0﹩\mathop{.}\limits^{\unicode{x02033}}﹩80 × 0﹩\mathop{.}\limits^{\unicode{x02033}}﹩67 is shown in the lower left corner of each panel.