To access this, the user should set SAS_ODF to point to the ODF in question. However, the information is optional. If the user does not have access to the ODF, it can be rendered unnecessary by setting writeobskwds to `no' or `false'. In this case the only effect is that some observation-specific keywords are not written to the file header. (Note that ODF access is required if it is desired to recalculate the attitude.)
