Blue histogram is the rest equivalent width distribution of the Ca II K lines detected in our sample; grey-hashed histogram is the scaled equivalent width distribution of Ca II K lines detected in the SDSS by Sardane et al. (2014). The two cumulative distributions are shown in the insert; considering the detection limit of SDSS, we applied the Kolmogorov-Smirnov test when W(Ca IIλ3934) > 0.35 Å.
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