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Typical ‘saw-tooth’ pattern of the spring extension and restoring force over two oscillatory periods for two-threshold systems (see text). Black line, left hand vertical axis: extension (equation (2.6b)); grey line, right-hand axis: force (=ax+(bx)P); constructed with the parameters and thresholds for system V1 (see table 1). X(thr0): and X(thr1) extension at force thresholds 0 and 1(here 2.3 and 3.8 pN); d0 and d1: sub-step sizes (here 13.5 and 22.5 nm).
