c      Jon Ramsey's (rationalised) shock tube
c
 $rpcon     rhoL=10.0  , pL=0.36, vxL=0.003, vyL=0.0
          , vzL=3.0, byL=0.3, bzL=0.0, bx0=0.28
          , rhoR=0.1, pR=0.36, vxR=0.0   , vyR=0.0
          , vzR=0.0      , byR=0.26, bzR=0.0
          , psi0=4*0.1, tag='j2', aspect=0.9
          , phdr="Jon's rationalised shock tube", iftr=1               $
