Channel maps of H¹³CO⁺ 4-3. To create this image the cube was re-binned in the spectral axis by a factor of two to increase the S/N. The contours are at levels [6, 9, 14]σ, where σ of this re-binned cube is equal to 1.8 mJy beam⁻¹. The red and blue contours correspond to positive and negative velocities respectively, expressed in km s⁻¹ with respect to the adopted systemic velocity V_sys (= 5.3 km s⁻¹ in the LSR frame). The peak of the continuum is indicated by a cross and the jet axis by a dotted line.