Velocity-integrated flux densities of the 22 GHz H₂O masers observed with the VLA. A vertical dashed line indicates the LSR velocity of 6.4 km s⁻¹, corresponding to the brightest components during the VERA monitoring (Fig. 2). The red and blue lines correspond to the spectrum integrated around the central source NIRS 3 and that of the newly found feature offset by 5′′ northwest (NW) of NIRS 3, respectively.