Fig. 7.
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Ratios of the two strongest CaT lines (EW2/EW3) as a function of S/N. The vertical dotted red line is at S/N = 13, and dotted blue lines are limits of the reasonable values of the ratio at 0.2 < EW2/EW3 < 2.2. Outside this range there is most likely a problem with a poorly subtracted sky line interfering with the measurement of EW2 and/or EW3.
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