Comparison of the four strongest duplicate pairs present in the source literature. Duplicate lines profiles are shown in green, the duplicate-free BRASS spectrum is shown in blue, and the solar FTS flux spectrum, described by Neckel & Labs (1984), is shown in black. The four duplicate pairs rest wavelengths, shown by dashed lines, are as follows: top: 4446.275 and 4449.424 Å, middle, dashed: 4524.883 and 4528.144 Å, middle, dotted: 4525.944 and 4529.206 Å, and bottom: 4600.595 and 4603.966 Å.
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