Left panel: correlation of the velocity dispersion as a function of the scale, the blue line, derived using the Osaka ¹³CO data. The green curve is the Larson’s relation σ = 0.63 L^0.38, where L is the scale length; and right panel: velocity dispersion as a function of position in the filament, starting from north-west and moving south-east along the filament at one parsec scale.