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Tmt for the Skellam model in (a) one dimension, (b) two dimensions and (c) three dimensions, with initial Gaussian condition. The values of the parameters are D = 0.0025 mm2 d−1, ρ = 0.007 d−1, σ = 4 mm2, S = 0.85, u1 = 0.1 and u* = 0.3. Upper and lower red dashed lines correspond to Tmt(ΔOpt) and T(1), respectively (see equation (2.11)). (Online version in colour.)
