problem.nx = 1280
problem.dens_base = 2.6e9
problem.temp_base = 6.0e8

problem.dens_conv_zone = 1.3e8

problem.low_density_cutoff = 1.e-3
problem.temp_fluff = 1.e7

problem.xmin = 0.0
problem.xmax = 5.e8

problem.cfrac = 0.3

