You could try the programs I put on info-iris. I did send some people individual copies of what I had, but I don't remember who. It has been a while. -- Brent L. Bates NASA-Langley Research Center M.S. 294 Hampton, Virginia 23665-5225 (804) 864-2854 E-mail: blbates at aero4.larc.nasa.gov or blbates at aero2.larc.nasa.gov