1 0 GfsAdvection GfsBox GfsGEdge {} {
  Time { end = 0.785398 }
  Refine LEVEL
  VariableTracer {} T { gradient = gfs_center_gradient }
  AdvectionParams { cfl = 0.5 }
  Init {} {
    U = -8.*y
    V = 8.*x
    T = {
      double r2 = x*x + y*y; 
      double coeff = 20. + 20000.*r2*r2*r2*r2;
      return (1. + cos(20.*x)*cos(20.*y))*exp(-coeff*r2)/2.;
    }
  }
  OutputErrorNorm { start = end } { awk '{ print LEVEL " " $5 " " $7 " " $9}' } { v = T } {
    s = {
      double r2 = x*x + y*y; 
      double coeff = 20. + 20000.*r2*r2*r2*r2;
      return (1. + cos(20.*x)*cos(20.*y))*exp(-coeff*r2)/2.;
    }
  }
}
GfsBox {}