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subroutine CalculateSolutionGradient_DGModel1D(this)implicit none class(DGModel1D),intent(inout)::this! Localinteger::ndofcall this%solution%AverageSides()! Account for the outward pointing normal before computing dg derivativendof=this%solution%nvar*this%solution%nelem*2call GradientNormal_1D_gpu(this%solution%boundarynormal_gpu,&this%solution%avgBoundary_gpu,ndof)call this%solution%MappedDGDerivative(this%solutionGradient%interior_gpu)! interpolate the solutiongradient to the element boundariescall this%solutionGradient%BoundaryInterp()! perform the side exchange to populate the! solutionGradient % extBoundary attributecall this%solutionGradient%SideExchange(this%mesh)endsubroutine CalculateSolutionGradient_DGModel1D