Comments to Xihan:

  * In the introduction, need to highlight/emphasize the differences in sample selection criteria between Bait et al and our work.
  * the values of stellar mass in Fig.1 are inconsistent with those in Table 1, which I think is a factor of log(h*h)=0.3 dex. Let's orrect the figure (and other figures with the same problem) using h=0.7, as claimed at the end of the introduction.
  *