Top: LOOK g-filter reduced magnitudes (green circles) vs. time with third-order interpolated splines fitted to synthetic data overplotted (green). Middle: LOOK r filter reduced magnitudes (red circles) vs. time with third-order interpolated splines fitted to synthetic data overplotted (turquoise). Bottom: g − r color index value calculated from the predicted magnitudes in each filter from the synthetic magnitudes plotted across time. Red circles denote nominal color index values with green lines highlighting the range that includes the central 68.3% of synthetic values.