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Shepard's interpolation method performance. The relative RMSE (rRMSE) is represented for each case for p = 4. (A) Rotor. rRMSE = 0.314 for p = 4, M = 20 and σ = 0.14. (B) Sinus rhythm. rRMSE = 0.121 for p = 4, M = 2 and σ = 0.05. (C) Chaotic. rRMSE = 0.337 for p = 4, M = 20 and σ = 0.12.
