Fig. 4From: Separation of magnetotelluric signals based on refined composite multiscale dispersion entropy and orthogonal matching pursuitThe EMTF data are disturbed by a noisy signal with a square wave interference of the Hx and b charge and discharge triangle wave interference of the Ey; c is a comparison of the apparent resistivity-phase and error curves. Curve 1 is the original data, curve 2 is the noisy data, curve 3 is the RR method, curve 4 is the OMP-based overall method, and curve 5 is the proposed methodBack to article page