  Correlation between the variations of quasar absorption lines and the
ionizing continuum have been recently confirmed in systematic studies. However,
no convincing individual case is reported. We present a statistical analysis of
the variable C iv broad absorption line (BAL) in the quasar SDSS
J141007.74+541203.3, which have been observed with 44 epochs by the Sloan
Digital Sky Survey Data Release 14. Grier et al. (2015) has recently concluded
that the most likely cause of the variability of the BAL in SDSS
J141007.74+541203.3 is a rapid response to changes in the incident ionizing
continuum. In this paper, we confirm the anticorrelation between the equivalent
width of BALs and the flux of the continuum based on the spectra of this quasar
that show significant variations, which serve as another independent evidence
for the view of Grier et al. (2015).
