Fig. 3
a) Simulated 30 point sources on a map of 300 × 300 pixels; b) same as in panel (a) with the addition of a Gaussian white-type noise. The amplitude of the sources is well below the noise level; c) zero-mean unit-variance version of the noise map after the application of the MF; d) zero-mean unit-variance version of the map obtained after the application of the MF to the map in panel (b).
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