C II wave loggf source Chi_low log(N_CII/Ntot) 3918.968 -0.533 NIST5 131724.37 -3.8 blend 4267.001 +0.563 NIST5 145549.27 -3.8 blend 6578.052 -0.021 NIST5 116537.65 -3.8 6582.882 -0.323 NIST5 116537.65 -3.8