Table 1: Table of parameters for numerical simulations Figs. 1-7.
Parameter Value  
$\kappa_{0}$ $4.0\times10^{11}$ a constant parameter
$\kappa_{1}$ $1.0\times10^{-2}$ a constant parameter
$\kappa_{2}$ $4.0\times10^{9}$ a constant parameter
$\hat{\zeta}(\xi_{i})$ $1.0\times10^{-9}$ initial $\hat{\zeta}$ value at $\xi_{i}$
$\hat{\beta}(\xi_{i})$ $1.0\times10^{-9}$ initial $\hat{\beta}$ value at $\xi_{i}$
$\xi_{i}$ 500 initial $\xi $ value
$m_{\max}$ 3001 number of spatial points
d$\Xi$ $2.5\times10^{-6}$ spatial mesh increment
A0 0.01 perturbation amplitude, $\Delta/\Sigma_{0}$
$\varsigma$ 750 half-width of initial perturbation
$\lambda$ 5.0 Gaussian coefficient
m0 1750 centre of perturbation
d$\tau $ $1.5\times10^{-8}$ temporal mesh increment
$n_{\max}$ 2000 number of time steps

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