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The M emission spectrum of 68 Er was reinvestigated using wavelength dispersive spectrometry, with a TAP diffracting crystal. By recording the spectra using the second-order reflection, an improved energy resolution was achieved, which is necessary to resolve the M 5 O 3 line from the neighboring a M 5 N 7 transition. In addition to the five lines/bands tabulated in the classical paper of Bearden, a number of further lines were observed. These are . For all the lines with an energy below the Mdoi:10.1017/s1431927607070389 pmid:17490501 fatcat:3hejjpcgyvdwxmg2aybrzqzbqi