Saturation pressure of water above the triple point temperature computed from temperature according to Wagner et al. (1993). The range of validity is between 273.16 and 373.16 Kelvin.
Wagner W., A. Saul, A. Pruss. International equations for the pressure along the melting and along the sublimation curve of ordinary water substance, equation 3.5. 1993. http://www.nist.gov/data/PDFfiles/jpcrd477.pdf.