Panel a) O vi 1031.9   Å line intensities along the UVCS slit at the four altitudes where the UVCS slit was set. The spatial bin values increase along the southward direction. We show only data in bins 1 to 18 for the first three slits and from 1 to 16 for the fourth. Panel b) same as panel a) for the H i Lyα line. Panel c) same as panel a) for the H i Lyβ line, except in the first slit, where data were considered only up to bin 13. Intensities are given in ph/s/cm²/sr.