Spectrum of iron in the range λ320–λ350: the spectrum in the middle panel was recorded with our moderate-resolution LoWEUS spectrograph at the EBIT-I electron beam ion trap at an electron beam energy of 1000 eV. Fiducial markers indicate line positions as judged visually at this spectral resolution. The spectral features that arise from second diffraction order (denoted “2”) should not affect the SDO/AIA data. The approximate band pass function of the SDO/AIA λ335 channel is indicated in the top panel. The lowest panel shows a high-resolution spectrum at half the wavelength, in which the strongest lines and line groups are identified by spectrum number. Strong first-diffraction order lines in this spectrum may appear in second diffraction order in the spectrum in the middle panel.