C¹⁸O(1−0) spectra observed toward 6 filaments in Aquila. The corresponding Gaussian fits are highlighted in blue. Note that the scale of the y-axis has been adjusted to match the peak temperature of each spectrum. Note 1: filament 20 shows two components separated by 0.63 km s^-1. The component at V_LSR = 7.17 km s^-1 have been chosen to be tracing the filament, since this component has a velocity component which is closer to the average velocity ( km s^-1) of the filaments in Aquila which show one velocity component. Note 2: the spectrum observed at the position of filament 22 shows two velocity components, one centered at 6.5 km s^-1 and the other at 7.7 km s^-1. The strongest component has been selected for similar reasons to that explained for filament 20. Note 3: the spectrum observed at the position of filament 25 has two velocity components (at 5.0 km s^-1 and 6.52 km s^-1, respectively). The strongest component has been selected for similar reasons to that explained for filament 20. Note 4: the spectrum observed at the position of filament 26 shows three velocity components centered at 7.28 km s^-1, 8.45 km s^-1 and 9.17 km s^-1, respectively. The component centered at 7.28 km s^-1 has been selected because it is the component with the closest V_LSR value to the mean of neighboring filaments in Aquila.