Solution of the relativistic blast problem with a Lorentz factor γ = 6 shock detailed in the text at time t = 0.35. Left: Pressure (P), density (D), and velocity (V) as computed on a very fine mesh (25600 cells) showing the shock, the contact discontinuity, and the rarefaction fan. Right: Zoom into the thin high-density layer between the shock and the contact discontinuity. This feature is the most difficult to resolve. We show the solutions based on different resolutions: 400 cells (black), 1600 cells (blue), 6400 cells (pink), 12800 cells (green), and 25600 cells (orange).