Figure 5:
Spatial profiles of S II 1256Å near Io. Profiles from each
STIS image are shown separately. Each dot is the average of one row
(along the dispersion direction) of the slit image, excluding areas
overlapping the 1216Å and 1299Å slit images. The solid line is a
sliding boxcar average of the data over a
1 RIo
interval. The vertical
dotted lines enclose the projection of Io's disk. The lower pair of
curves show the modeled torus contribution for 
= 0.025 (dashed)
and = 0.040 (dash-dot); the upper pair are the same with an
empirically chosen constant offset to compensate for scattered light in
the instrument.
