Under Expression, open the Explore... popup mcnu.

Select the button "Find Genes Matching Criteria..."

Fill out the criteria as shown in the screen shot below, which checks for a factor of 2 induction or repression in the first two hours of the diauxic shift experiment:

This search finds 22 genes meeting the desired criterion. This is slightly more than the 19 genes reported by the authors as meeting the criterion. The following plot shows the expression profiles for these 22 genes over the entire time course. (Note that these profiles have not been log transformed.)