Peak values of a Gaussian fit applied to the estimated HISA spectra. This panel presents the fitted peak values of the extracted HISA spectra. The spectra have been fitted with a single-component Gaussian curve. The black contours represent the integrated ¹³CO emission from 42 to 57 km s⁻¹ at levels of 10.5 and 15 K km s⁻¹. The red dashed polygons define the eastern and western part of the filament. The yellow circles mark the regions of the spectra shown in Fig. 4.