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The EUV spectrum of Fevii is reviewed, using new rates for electron impact excitation, atomic structure calculations, and experi- mental data. In particular, solar observations of a Sunspot loop spectrum obtained from the Hinode EUV Imaging Spectrometer (EIS) are used. Previous line identifications, mostly based on lab oratory data, have been assessed. Large discrepancies between observed and predicted line intensities and wavelengths are found for the decays from the 3s2 3p5 3d3 configuration, which are strong EUV lines. We ascribe these discrepancies to incorrect line ide ntifications. A number of new identifications are proposed. W ith these, very good agreement between theory and experimental data is found. A few transitions, in particular from the 3s 2 3p6 3d 4s configura- tion, are observed for the first time, and are shown to provide a new important diagnostic for measuring the electron temperature in the solar transition region. The temperatures obtained at t he base of solar coronal loops are found to be close to the temperature of maximum abundance in ionization equilibrium (log T (K)= 5.4). The assessment of the Fevii lines was done in conjunction with an assessment of all the strongest cool lines observed with EIS. This spectrum is rich in transition region lines. Some new identifications are presented, in particular for Feix. Most of the strongest transitions are identified, however a large number of lines still awaits firm identification.

Benchmarking atomic data for astrophysics: Fe VII and other cool lines observed by Hinode EIS