Use RK4 when not cap stable to simulate depletion time.
Use RK4 when not cap stable to simulate depletion time.

osmium-org/osmium,copyliu/osmium,osmium-org/osmium,osmium-org/osmium,osmium-org/osmium,copyliu/osmium,wffurr/osmium,wffurr/osmium,wffurr/osmium,wffurr/osmium,copyliu/osmium