Emissivity ratio curves of the weaker lines in the Parkinson (1975) active region spectrum. λ_ob indicates the observed wavelength. The indices the lower and upper level are then shown. I_ob indicates the observed intensity, in 10^-6 erg cm^-2 s^-1. “N” is a new identification. “bl” indicates the presence of a blend, “u” with an unidentified line. The observed intensities of a few lines have been multiplied by the factors shown.