./outbgrid.h 
      1 numprocs
   -1 n_step
  0.0 t
 1.0   0  360. -90 90 plot_range
 -1.00000E+00 -1.00000E+00 -1.00000E+00  1 -359.9999 -179.9999  0  plot_dx, dxmin, ncell
      4 nplotvar
      1 neqpar
6.96e8
B_r B_p B_t B R_S
R R R nT nT nT nT
       T save_binary