Recurrence time versus local mass accretion rate per unit area onto the compact object, where the circles and triangles represent the type-I X-ray bursts detected by XMM-Newton and INTEGRAL/JEM-X, respectively. The dashed red lines represent the best-fit power-law model for all bursts Δt_rec ∼ ⟨ṁ⟩^{−1.02±0.03}. The recurrence time decreased from ∼2 h to ∼1 h as the persistent spectrum showed the transition from the hard to the soft state.