Dynamic spectrum of the 6.7 GHz methanol maser emission for S255IR-NIRS3. The color scale maps to the flux density as shown in the wedge on the top. The flux densities are linearly interpolated between consecutive 32 m telescope spectra. The velocity scale is relative to the local standard of rest. Individual observation dates are indicated by black tick marks near the left ordinates. The horizontal dashed lines from bottom to top mark the approximate times of the start, first peak, dip, and second peak of the burst.