Fig. 8From: Separation of magnetotelluric signals based on refined composite multiscale dispersion entropy and orthogonal matching pursuitComparison of the polarization direction (scatter plot and histogram) for site EL22174: a scatter plot of the electric field data at 2Â Hz; b histogram of the magnetic field data at 2Â Hz; c scatter plot of the electric field data at 4.2Â Hz, and d histogram of the magnetic field data at 4.2Â HzBack to article page