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DEFINE_PROFILE(x_velocity,thread,nv)
{
  float x[3]; /* an array for the coordinates */
  float y;
  face_t f; /* f is a face thread index */
  begin_f_loop(f, thread)
{
   F_CENTROID(x,f,thread);
   y = x[1];
   F_PROFILE(f, thread, nv)
    = 2*(1- y*y/(0.04*0.04));
  }
  end_f_loop(f, thread)
}
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