Fig. 3.
Illustration of the kNN weighting procedure applied to the training data for the KiDS DR3 photo-zs, as projected to colour-colour planes. Red contours show the unweighted spectroscopic training data, while the blue ones are for the reference photometric sample (FIDUCIAL). The greyscale pixels show the distribution of the weighted spectroscopic sample. The contours are linearly spaced.
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