6.3.4 Finite Difference (TYPE2)

NumRu::DCL.uvdif(upx,upy1,upy2) Fills the space between 2 lines with a tone pattern.
NumRu::DCL.uhdif(upx1,upx2,upy) Fills the space between 2 lines with a tone pattern.
NumRu::DCL.uvdifz(upx,upy1,upy2,itpat1,itpat2) Fills the space between 2 lines with a specified tone pattern.
NumRu::DCL.uhdifz(upx1,upx2,upy,itpat1,itpat2) Fills the space between 2 lines with a specified tone pattern.