Spectral properties of the Hα profiles within the chromospheric jet for two time steps when it is visible. The background image corresponds to the intensity at the position Δλ = −1200 mÅ from the Hα core. First and second row: Doppler velocity Δv and line width, respectively. Third row: Full Hα profiles for pixels within the dark feature (grey profiles), it is the correspondent mean profile (black profile) and the Hα average profile for the full FOV as reference (orange dotted profile). The blue dashed line marks the Doppler velocity (first moment) of the separated blueshifted component calculated for the average profile of the jet, and the green dashed line marks the COG velocity calculated for the average profile of the jet.