Outflow structure around W51-IRS2. The orientation of all panels is aligned with ICRS coordinates. Left: the background image is a composite of NIRCam F162M (red), F210M (green), and F405N (blue). The green contour shows the ALMA CO (2–1) moment 0 map from the ALMA-IMF large program (F. Motte et al. 2022; N. Cunningham et al. 2023) with a radial velocity range of 70–90 km s⁻¹. Upper right: a zoomed-in composite of F162M (red), F210M (green), and F187N (blue) for the outflow knot. The red contour displays the ALMA 3 mm continuum above 3σ = 5.25 mJy beam⁻¹ from ALMA observation 2017.1.00293.S (A. Ginsburg & C. Goddi 2019). The cyan contour exhibits the VLA Ku-band continuum. Middle right: GTC H₂-K image (A. Dawson et al. 2025) for the knot cutout. Lower right: another zoomed-in image around W51-IRS2E and W51north. The background image is an ALMA 1.3 mm long baseline (2015.1.01596.S; A. Ginsburg & C. Goddi 2019) image created by feathering with the ALMA-IMF image. ALMA CO (2–1) (green contour) and HCN (1–0) v = 0 (yellow contour) moment maps are displayed as well.