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Fig. 2

image

Example of a non-stationary covariance matrix, which can be used to simulate . The colour bar units are Jy2. The correlation scale στ is 40 cells, and the variability period is 500 cells. The matrix is made positive semi-definite (and therefore a covariance matrix) through SVD decomposition. The maximum size of the “bubbles” is determined by στ.

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