geometry.coord_sys = 0        # 0 => cart, 1 => RZ
geometry.prob_lo   = 0 0
geometry.prob_hi   = 1 1
geometry.is_periodic = 0 1
cg.v = 2
cg.maxiter = 500
mg.v = 2
mg.usecg = 0
cg.maxiter = 500
boxes = grids/gr2D
