Resolving power capability for various N_tol parameters. Computation refers to two identical box-shaped flares: L is the width of each flare, ρ_F is the event density of the flare, and ρ₀ is the background event density. There are N_tol background events in between the two flares. The continuous curves represent the minimum flare width for which the two contiguous flares are resolved. The dotted curve is the sensitivity limit (99.87% c.l.) for two identical box-shaped flares. For any given two identical flares of length lower than the computed values are not resolved.