Auto-correlation total-power (solid red lines, AC) and scalar-averaged cross-power (blue solid lines, XC) spectra of the H₂O masers. Thespectra were computed by averaging all the antennas/baselines and time ranges. Baselines were subtracted by fitting the line-free channels with a polynomial function. A vertical dashed line indicates the LSR velocity of 6.4 km s⁻¹, corresponding to the brightest components.