// get prolongation order from driver, the parmeter is private since really
  // there is normally no reason to depend on it
  int order_type;
  const void *order_p = CCTK_ParameterGet("prolongation_order", "AMReX",
                                          &order_type);
  assert(order_p);
  assert(order_type == PARAMETER_INT);
  const CCTK_INT operator_order = *static_cast<const CCTK_INT*>(order_p);

    data[p.idx] = p.x;

    data[p.idx] = pow(p.x * p.y * p.z, operator_order);