Position along the spectrograph slit (vertical direction) against radial velocity for the Ca II K resonance line (top) and UF at 8692 Å (bottom) in V854 Cen. The continuum flux has been subtracted, and all flux within 0.7″ of the central object has been set to zero to enhance the visibility of these extended features. The thick blue line shows the expected maximum radial velocity at each position for a spherical shell of radius 3.5″ and expanding with a velocity of 250 km s⁻¹. The unidentified emission feature at 8692 is spatially extended as well.