Recently experimentally determined individual(fine structure) line strengths for the spectra of NI, FI, and Nell are analysed, searching for regu- larities resulting from similarities in the structure of these species. Strengths of spectral lines of the prominent 3s-3p and 3p-3d transition arrays are investigated. The absolute scales of these experimentally derived data are based on independently determined lifetimes for excited levels of NI, FI, and Nell. The simple Coulomb approximation method was applied for calcula- Tions of the matrix elements for the "jumping" electron in order to obtain An average trend in line strengths of the studied emitters.
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