Continuum-subtracted Hα linemap of V900 Mon and Thommes’ nebula. The map has been linearly scaled to enhance the emission features (in white) and designate the scattered light continuum from the nebula and background sources (shaded black regions). The green contours (arbitrary levels) mark the CO (2–1) moment-zero map similar to Takami et al. (2019), showing the blueshifted emission component to the west and part of the redshifted wide-angle lobe to the east. The ELK is clearly visible and co-aligned with the blueshifted CO outflow, as indicated by the guiding arrow (PA ~ 250° east of north). The FOV is 50″ × 50″.