(a) Plasma mass density (solid blue) and velocity (dash-dotted red) distribution along the z axis from the ESTHER simulation at 5 ns. The dashed blue line shows the best fit of the mass density lineout. (b) Temperature dependence of the fastest growing mode wavelength (solid blue) and the growth time (dashed red) for the RT instability, using the parameters from the ESTHER simulation at 5 ns around z = 350 μm for Eq. (11).