修改以下语句的语法和拼写错误进行润色保留括号内的参考文献：These two sources were not included in the catalog of He et al 2017 because the signal-to-noise ratios of their spectra did not meet the sample selection criteria of He et
These two sources were not included in He et al.'s (2017) catalog because their spectra did not meet the sample selection criteria in terms of signal-to-noise ratios. (He et al., 2017)
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