– 24 – Fig. 3.— Correlation between the 3.6 µ m and 4.5 µ m light curves for sources with measured [5 . 8] − [8 . 0] colors (“Photometry Group 3” sources; see Section 3) with four epochs of data for Variability Level 2, 3, and 4 ( σ$_{12}$ > 2, > 3, and > 4) sources. We only consider sources in the shaded, highly correlated r > 0 . 8 region as true variables, and we use the density of the poorly correlated r < 0 . 5 sources to estimate our false positive rates (Tables 3–5).