Figure 9: Contour plot of the expected ROSAT/PSPC count rate for V Sagittae. The levels are labeled by the log of the count rate "cr" in cts/s. The source bolometric luminosity is 5´ 10³⁷ erg/s and the distance is 3,000 pc. Curves represent an interpolation over a grid of 10´ 10 temperature versus n_H points. ROSAT observations correspond to a level log(cr)=-2.0± 0.1. The plotted levels extend down to 10^-6 cts/s.