Fig. 1From: Nonlinear dynamical analysis of GNSS data: quantification, precursors and synchronisationExamples of recurrence plots. a White noise. Any patterning occurs by chance. b A sine-wave with no noise. The vertical (or horizontal) distance between red lines is the period of the signal. c A sine-wave with noise. The signal is blurred and there is a faint underlying patterning of horizontal and vertical lines but the overall pattern of diagonal lines is preservedBack to article page