Figure 4

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according to equation (2), for
(a) u 0 = 0.5, years: 2013, 2014 and 2015. (b) u 0 = 0.7, years: 2013, 2014 and 2015.
according to equation (2), for
(a) u 0 = 0.5, years: 2013, 2014 and 2015. (b) u 0 = 0.7, years: 2013, 2014 and 2015.