Two Doppler tomograms constructed from the emission line observations of IP Peg on the rise to an outburst (bottom panels). Left shows an image constructed from the Hydrogen emission, the image on the right from the Helium emission. The top panels show the observed emission line profiles from which the bottom maps are constructed. The bright spot near the center is emission from the mass donating companion star. The expec ted ballistic trajectory from material leaving this star is plotted to the left of it. Upper cross is the common center of mass of the binary, while the lower cross denotes the position of the white dwarf, not visible in the optical line emission. Most of its energy is radiated in the UV/X-ray regime. The emission of the accretion disc forms a two armed trailing spiral around the white dwarf, closely resembling predicted models based on theoretical work on this tidal inter action.