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Fig. 4

image

Galaxies in the well resolved image set are assigned random centroid errors, then Gaussian noise is added, after which the shear is measured with SNAPG. Measured multiplicative bias in the shear is plotted versus the mean S/N of all galaxies on the images, with m1 in black and m2 in red. Each datapoint is based on the shear estimates of all 2.89 million galaxies in the well resolved image set. SNAPG results with the exact centroid covariance matrix are shown as dashed lines and results without centroid error correction as dotted lines. The bias from misplaced centroids can be reliably removed by SNAPG, regardless of the noise added to the images.

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