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The volume time series is a representative numerical solution of Eq (4). For this solution rainfall is assumed as R(t) = R 0(1 + a sin(2πft))(1 − bt), with R 0 = 1.1, a = 0.4, f = 0.4 and b = 0.01. All the other parameters are the same as in Fig 6. The parametric plot V(t)xR(t) for this solution is given in the inset of Fig 3.
