[en] Steady state post-dryout data have been obtained for both upflow and downflow in a 9.75 mm diameter, 920 mm long vertical tube, by means of the ''hot patch'' technique. This method uses indirectly heated copper blocks brazed onto either end of the test section tube. The blocks operate above the critical heat flux and stabilise the quench front beyond the tube, which may then be operated down to low heat fluxes and thermodynamic qualities. The range of data was limited by the ability of the hot patches to hold the quench front. In upflow data were obtained up to 200 kg m^-2 s^-1 at 20 bar and 1000 kg m^-2 s^-1 at 5 bar. Downflow operation was possible up to 200 kg m^-2 s^-1 at 5 bar and 500 kg m^-2 s^-1 at 2 bar. The majority of the data were obtained with an inlet subcooling of about 5⁰C, although subcoolings as high as 26⁰C were used. Heat fluxes were in the range 0.5 to 50 Wcm^-2 while outlet equilibrium qualities were between zero and 60%. This report gives a full listing of the data from the test series together with such details as are necessary to permit further analysis. (author)