Spectrum of the brightness temperature in the masing methanol 14₁−14₀ A⁻⁺ line on the velocity axis (zero velocity corresponds to the rest frequency of this transition) within the synthesized beam toward the maser brightness peak (solid line). The dashed line shows the spectrum centered on the CH₃OH 16₁−15₂ A⁻ line. The intensity of this line is multiplied by a factor of 3. The dotted vertical line indicates the systemic velocity of the S255IR-SMA1 clump (4.8 km s^-1), as found by Zinchenko et al. (2015).