3C 403, HEG, 1″ = 1.13 kpc. The black circle in the first panel has a diameter of 3 times the seeing of the observations; the dashed line in the second panel marks the radio position angle. The gas in outflow is mainly observed in a compact region. Its flux is concentrated into a radius of ∼1″. However, the gas also weakly extends in the NW-SE directions. The [O III] is blueshifted, reaching ∼ − 1940 km s⁻¹. Its energy peaks in the nucleus where the median velocity of the gas is by ∼ − 430 km s⁻¹.