Velocity channel maps of (a) CH₃OH (4_2, 3-3_1, 2) E and (b) p-H₂CO (3_0, 3-2_0, 2). The green framed panel marks the systemic velocity of IRS7B, while the blue- and red- framed panels represent the blueshifted and redshifted components of the emission, respectively. The emission was masked at 3σ, and the colour bar peaks at 75σ, where the average 1σ noise in each channel is (a) 1.2 mJy beam⁻¹ and (b) 2 mJy beam⁻¹. The black arc shows the ALMA Band 6 FoV. Each panel reports the corresponding velocity. (a) Channel map of CH₃OH (4_2, 3-3_1, 2) E (b)Channel map of p-H₂CO (3_0, 3-2_0, 2)