MUSE spectra of V900 Mon (star+disk; blue) and the ELK (orange). Prominent lines in the V900 Mon spectrum, like hydrogen Balmer lines and the Ca II triplet, are seen in absorption. In the knot spectrum, the Hα, [N II], and [S II] lines are clearly seen in emission, while the [O I] line suffers from terrestrial contamination (e.g., airglow O I). Both spectra are affected by skyline contamination at the blue and red ends. The spectra have not been corrected for extinction. Normalized line profiles vs. radial velocities (corrected for systemic velocity) are shown in the bottom panels.