A rigid solid sphere falls with constant velocity in a fluid. Given: viscosity of the fluid μ = 0.1 Pa·s, gravity g = 10 m s^-2, particle density ρ_p = 1180 kg m^-3 and fluid density ρ_f = 1000 kg m^-3. The diameter (in mm, rounded off to the second decimal place) of the largest sphere that settles in the Stokes’ law regime (Reynolds number ≤ 0.1) is ______?