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The spectral absorption coefficients of neutral and singly ionized carbon nitrogen, and oxygen atoms a r e presented. The continuum contributions resulting from bound-free and free-free transitions a r e presented in terms of an effective cross section summed over all permissible initial and final states. These effective continuum cross sections a r e tabulated spectrally over a frequency range 0.25 eV 5 hv 5 20 eV for temperatures in the range 3,000"K to 24,000"K at 1,000"K intervals. The discrete, i. e. line. contributions resulting from bound-bound transitions a r e presented in terms of tabulations of absorption f-numbers for all significant transitions (multiplet, supermultiplet, and transition arrays). Electron impact (half) half-widths and line shifts for Lorentzian line shapes a r e tabulated for all significant transitions for temperatures in the range 2,500"K to 25,000"K.

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