xXInitiation of rapid tilt upYConclusion of rapid tilt upXInitiation of rapid tilt down YConclusion of rapid tilt downHXMisfire of marker signal XInitiation of slow tilt up@0XConclusion of slow tilt upcXInitiation of slow tilt downF/XConclusion of slow tilt downw7XStand upXTransition back to supine1XStand upXTransition back to supine>XInitiation of slow tilt up0XConclusion of slow tilt up̴XInitiation of slow tilt down/XConclusion of slow tilt down[XInitiation of rapid tilt upYConclusion of rapid tilt up XInitiation of rapid tilt downUYConclusion of rapid tilt dow