Simultaneous fit to 15 transits of extrasolar planet TrES-3b corrected for trends (see Eq. (10)). The fit parameters according to Eq. (14): A = 0.02725(19) mag, D = 0.0117(7), C = −0.17(7), and Γ = 1.58(12), the parameter K was not introduced. The black line is the fit, circles are the normal points, grey circles indicate individual measurements with the area proportional to their weights.