Power spectra of the sheared ellipticities as obtained by MegaLUT + SEWIN for each set of the challenge. This figure can be directly compared with those from all GREAT10 submissions described in Kitching et al. (2012). The red lines represent the measured shear power, obtained without the denoising term, while the green lines represent the true shear power. The inset gives the metrics ℳ/2, and Q (without denoising or training) for each set.