(a) Result of the registration of the two images used for 3D reconstruction,
acquired by P. Lazzarotti (left) and A. Bianconi (right). (b) Reconstructed
surface section, rectified to cylindrical projection. (c) Cross-section in
east-west direction through the vent and (d) albedo map, derived by two-image
photoclinometry. (e) DEM, viewed from the north-east, along with a rendered
view of the scene. The vertical scale is 10 times exaggerated. (f) Synthesized
view of the region around the vent under a solar altitude of 1.95° (left)
along with the corresponding rectified section of an image acquired by
C. Fattinnanzi under the same illumination conditions (right). The western flank
in the synthesized image cannot display a shadow because this shadow is cast from
the outside by the main rim of Petavius, but the shape of the shadow on the
eastern flank, which is cast by the dome itself, is in reasonable agreement
with its real counterpart.