Combined power spectrum showing the three P(k): black is Planck radiance, red is WISE and blue is MegaCam. The units of the y axis are arbitrary; each P(k) was scaled in order to match the others. For each P(k), we show data points corresponding to scales larger than the beam and where the power is above the noise component. The data points shown here are noise subtracted and divided by the beam function. The best fit gives P(k) ∝ k^{− 2.9 ± 0.1}.