fix gravity

Exec/science/xrb_layered/inputs_2d

@@ -7,7 +7,7 @@ geometry.is_periodic = 1       0
 geometry.coord_sys   = 0                  # 0 => cart, 1 => RZ  2=>spherical
 geometry.prob_lo     = 0.0     0.0
 geometry.prob_hi     = 3072    3072
-amr.n_cell           = 512     512
+amr.n_cell           = 256     256
 
 # >>>>>>>>>>>>>  BC FLAGS <<<<<<<<<<<<<<<<
 # 0 = Interior           3 = Symmetry
@@ -35,7 +35,12 @@ castro.use_pslope = 1
 castro.pslope_cutoff_density = 1.e4
 
 gravity.gravity_type = ConstantGrav
-gravity.const_grav   = -2.45e14
+gravity.const_grav   = -1.29e14
+
+# burning
+castro.react_rho_min = 1.e2
+castro.react_T_min = 5.e6
+
 
 # TIME STEP CONTROL
 castro.cfl            = 0.7     # cfl number for hyperbolic system
@@ -53,7 +58,7 @@ castro.v              = 1       # verbosity in Castro.cpp
 amr.v                 = 1       # verbosity in Amr.cpp
 
 # REFINEMENT / REGRIDDING 
-amr.max_level       = 0       # maximum level number allowed
+amr.max_level       = 1       # maximum level number allowed
 amr.ref_ratio       = 2 2 2 2 # refinement ratio
 amr.regrid_int      = 2 2 2 2 # how often to regrid
 amr.blocking_factor = 8       # block factor in grid generation