For slowly varying detector noise, the Wilson-Daubechies-Meyer wavelet noise covariance matrix is approximately diagonal, with off-diagonal terms controlled by the time and frequency derivatives of the dynamic spectral model.
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Non-stationary noise in gravitational wave analyses: The wavelet domain noise covariance matrix
For slowly varying detector noise, the Wilson-Daubechies-Meyer wavelet noise covariance matrix is approximately diagonal, with off-diagonal terms controlled by the time and frequency derivatives of the dynamic spectral model.