Lin-log (top) and log-log (bottom) snapshots of the density (green), temperature (red) and velocity (grey) profiles of a QPO cycle (square brackets) with the “W–Λ” setup; the accreted gas falls from the right to the left (adapted from de Sá et al. 2014). From left to right: beginning of a new cycle (t = 2750 s), growth of a hot slab of shocked material (t = 2884 s), quasi-isochoric cooling at the slab basis (thermal instability, t = 2994 s), collapse of the post-shock structure (falling back of the reverse shock, t = 3110 s) and end of the collapse (t = 3156 s).
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