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real function rlim(d1,d2)use modglobal,only:eps1implicit nonereal,intent(in)::d1!< Scalar flux at 1.5 cells upwindreal,intent(in)::d2!< Scalar flux at 0.5 cells upwindreal ri,phirri=(d2+eps1)/(d1+eps1)phir=max(0.,min(2.*ri,min(1./3.+2./3.*ri,2.)))rlim=0.5*phir*d1end function rlim