Expression profiles of the 101 gap gene circuits at different time points. Individual gene profiles are shown in light gray and the average profile of that gene at a specific time point is plotted using a colored solid lines. The x-axis corresponds to 35-92% of the A-P position and the y-axis describes the expression level influorescence units. Each panel corresponds to one of the 10 time points (12, 13 and 14A1-14A8) for which data are available. The experimentally measured expression profiles are plotted using colored dashed lines.