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There are several parts to this problem. Since the cloud is a 3-D object as viewed from outside
it is necessary to describe the exact position from which it is being viewed (ie. the output line
profile will depend on the viewing position). With the position specified the internal geometry
for the line of sight that passes through the cloud centre is calculated. Using this the correct
velocity window is selected and then within this window the line profile is calculated. These
steps will be described in turn.
1999-04-12