Magnitude differences between IRAC 2 and W2 plotted against the magnitude differences between MIPS 1 and W4 for the 241 protostars detected in all four bands. The lines, the annotations, and the purple circle have the same meaning as in Figure 4, while the orange circle marks the location of HOPS 383, which satisfies the outburst thresholds at these wavelengths but changed from a nondetection to a detection at 3.6 μm.