The exact solution of the Riemann problem of the Euler equations for the first half of the Woodward Collela blas problem.
The left state is given by (rho,u,p) = (1.0, 0.0, 1000.0), and the right state is given by (rho,u,p) = (1.0, 0.0, 0.01).
The solution is determined using the method specified in "Riemann Solvers and Numerical Methods for Fluid Dynamics" by Toro.