Second test of an optically thin shock tube. The blue and green lines show the results of simulations with 2° radial cells using a PLM reconstruction and a LimO3 reconstruction, respectively, with our reconstruction of f on the faces. The red line shows the result of a simulation with 2° radial cells using a PLM reconstruction with PLUTO’s reconstruction of f on the faces. The black line shows the reference solution using PLM reconstruction with 2¹⁷ radial cells.