Top image: part of the total density cross section for model ColdI, at the apex. We focus on the area with −0.3 ≤ y (Mm) ≤1.6 and 0.1 ≤ x (Mm) ≤2.0 to highlight the resolution of smaller scale structures on the x − y plane. Bottom image: density structure at y = 0.6 Mm, along the white line of the top image. The dots represent the grid points along the white line. The red line highlights the part visible in the image above. The plot shows time t = 10 P; P = 171 s indicates the period of the driver.