Fig. 8From: Radon spectrogram-based approach for automatic IFs separationNoise-free components and reconstruction errors. Noise-free signals f1,f2, and f3 defined in Eq. (24). a Spectrogram. b RSD. c Normalized l0-norm and reconstruction errors versus the threshold value. The threshold value h given by \(\mathcal {M}\) is indicated by a vertical lineBack to article page