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Fig. 8.

image

Comparison of the histograms of the asymmetry coefficients. (a,b) cB is computed directly with the magnetic data function of (a) the time t and (b) the spatial coordinate x (Eq. (2), x includes the ageing effect). (c,d) cB′,x is computed after the ageing effect is removed from the spatial coordinate (x′, Eq. (27)) and the magnetic field (Eq. (28)). The expansion factor, f(t), is derived with (c) a linear fit, and (d) a quadratic fit of the observed velocity (Eq. (15)).

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