Planet-to-star radius ratio k for the individual transit light curves. Black crosses show k when the linear LDC u is a free-fit parameter, and red points show the same value when u is fixed to its theoretical value given in Table 5. The error bars of the latter are on average 20 percent smaller than the uncertainties of the former so are not shown here. Data points in green show the value of k for the simultaneous fit of multiple transits per filter. The horizontal line shows the globally derived value of k as given in Table 3 and its uncertainty in dashed lines.