Left: CH₃OH 5₀ − 4₀ A⁺ line emissionobserved by the SMA. Middle: CH₃OH 5₀ − 4₀ A⁺ line emissiondetected by the APEX telescope. Right: CH₃OH 5₀ − 4₀ A⁺ line emission resulting from the SMA + APEX combination. All lines are integrated between 5 and 13 km s⁻¹. Contours are at 3σ, 6σ, 9σ, etc. The synthesised beam is shown in white in the bottom left corner of each panel. The dark red crosses and the white star illustrate the positions of the SVS 4 stars and of SMM 4, respectively.