Comparison between the normalized 1996 HST/FOS Mg II emission line profile (smoothed to the resolution of the IUE/LWP) with that determined from (a) the 1993 IUE/LWP monitoring campaign, and (b) the IUE/LWP archival data. Note that for the upper panel, no scaling between the HST and IUE spectra has been applied; the emission‐line fluxes and profile shapes are the same. The solid line in the lower panel shows the old average IUE/LWP Mg II flux scaled relative to the flux measured with HST. While the Mg II emission line flux clearly varies (a factor of 2.3), the profile shape remains invariant on timescales of several years. The absorption dip blueward of line center is due to Galactic Mg II.