Application of the curve-shifting techniques to subsections of the full light curves. The square diamonds (top) show measurements using only the first two seasons, the leftward triangles (middle) use the first five seasons, and the rightward triangles (bottom) use the last four seasons. All error bars depict total errors, as in Fig. 6. The blue- and green-shaded regions correspond to the interval covered by the total error bars using the full nine seasons, by the spline and regression difference techniques, respectively.