Evolution of the UV flux of RR Tel. Triangles are fluxes in the XMM-Newton OM bands computed from IUE spectra. Filled circles are fluxes measured by the XMM-Newton OM. Squares and diamonds are points derived from the STIS spectrum taken in October 2000 and the GALEX spectrum taken in June 2009, respectively. We note that data taken with the UVW1 filter are uncertain, as they may be affected by coincidence losses. The lines show exponential fits to the IUE data.