Growth of Si{111} near a pair of screw dislocations. One
dislocation is near the center of the surface while the other,
of opposite character, is at the simulation-cell edge. Periodic
boundary conditions have been used.
Note in the center right that steps from the two dislocations
have merged togeather and form a terrace with a growth front that
is rounded due to the rapid growth produced by kinks formed as
the separate steps merged.