修改措辞和语法错误：Using two sub-samples differing on the absorption trough depth vivek2019 found that the shallow trough sub-sample exhibits an even stronger correlation while the deep trough sub-sample does

vivek2019 discovered, through the use of two sub-samples that differ in absorption trough depth, that the sub-sample with a shallow trough exhibits an even stronger correlation. However, in the sub-sample with a deep trough, there appears to be no correlation between BAL variability and continuum variability (refer to Table 3 in vivek2019). These findings highlight the significant impact of BAL saturation on the correlation between BAL variability and continuum variability.