Secondary eclipse of WASP-33 b observed by CFHT/WIRCam in the CO filter on October 25, 2015. The top panel displays the unbinned (light-shaded points) and binned (dark-shaded points) light curves overlaid with the best-fit secondary eclipse model (solid red line). The middle panel isolates the binned data alongside the optimized eclipse model, while the bottom panel presents the residuals relative to the model fit. The rms of the binned residuals is 544.9 ppm.