Long‐term light curves of Mrk 335. The top panel shows the 2–10 keV light curve starting with the first X‐ray detection of Mrk 335 by Uhuru in 1971. The middle panel displays the 0.2–2.0 keV flux light curve starting at the EXOSAT observation in 1983 November. The bottom panel displays the UV flux light curve measured with IUE and HST at 2256 Å and XMM‐Newton OM and Swift UVOT using the M2 filters. Note that these UV data are not corrected for Galactic reddening. The XMM‐Newton data are adjusted to the Swift UVOT data. All fluxes are given in units of 10⁻¹⁴ W m⁻² (=10⁻¹¹ ergs s⁻¹ cm⁻²) as listed in Table 3.