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Instantaneous hydrostatic pressure gradients on mid-coronal plane for model II (reference configuration). Vector lengths are normalized by the maximum gradient magnitude of each subplot. (a–c) Open, mean and closed instants in free-vibration cycle starting at t = 0.25480 s. (d–f) Open, mean and closed instants in cycle with collision starting at t = 0.28170 s. Values in braces indicate the magnitude of largest instantaneous hydrostatic stress gradient
