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• We basically will go from here:

  peano::MappingSpecification
  exahype::mappings::XYZ::enterCellSpecification(int level) const {
    return peano::MappingSpecification(
      peano::MappingSpecification::WholeTree,
      peano::MappingSpecification::RunConcurrentlyOnFineGrid,true);
  }

  To here:

  peano::MappingSpecification
  exahype::mappings::XYZ::enterCellSpecification(int level) const {
    if (level < exahype::solvers::getCoarsestMeshLevelOfAllSolvers()) {
     return peano::MappingSpecification(
      peano::MappingSpecification::Nop,
      peano::MappingSpecification::RunConcurrentlyOnFineGrid,true);
    }
  
    return peano::MappingSpecification(
      peano::MappingSpecification::WholeTree,
      peano::MappingSpecification::RunConcurrentlyOnFineGrid,true);
  }

• Second, we should set the alterState bool only to true in mappings where this is necessary, i.e., where we perform reductions or use temporary variables.