1. Spectroscopic measurement of the vapour pressure of ice by K. Bielska, D. K. Havey, G. E. Scace, D. Lisak, and J. T. Hodges Philosophical Transactions A Volume 370(1968):2509-2519 June 13, 2012 ©2012 by The Royal Society

2. Calculated water vapour absorption coefficient (based on Voigt profiles) at T=296 K, a total pressure of 13.3 kPa and molar fraction of 10−3 water vapour in air. K. Bielska et al. Phil. Trans. R. Soc. A 2012;370:2509-2519 ©2012 by The Royal Society

3. (a) Measured spectrum (circles) and least-squares fit of the SDNGP (solid line) for transition 2 at x=2.22×10−4, p=13.3 kPa. K. Bielska et al. Phil. Trans. R. Soc. A 2012;370:2509-2519 ©2012 by The Royal Society

4. Temperature dependence of the fractional difference between our measured vapour pressure, ew,m, and the literature values, ew,lit, reported by Wexler [15] (circles) and Marti & Mauersberger [4] (triangles). K. Bielska et al. Phil. Trans. R. Soc. A 2012;370:2509-2519 ©2012 by The Royal Society