======== List of known problems with the ROD for XUV data ==== 29-Nov-91 ===

- For data sets sent out prior to Oct. 1st the values in the TIME column 
  of the OP<a>RAT.TBL are erroneous. This is only relevant for the 
  calculation of the deadtime correction (not possible with present EXSAS 
  release).
- For data sets sent out prior to Nov. 25 the naming convention of the 
  column labels in the OP<a>EFF.TBL is not consistent with EXSAS. This may
  cause problems when performing the EXSAS command MODEL/SPECTRUM. Old 
  column labels: EFF_AR_1 ... ; correct column labels  EFFAR_1 ... . This 
  problem can easily be remedied by overwriting the column labels with the 
  correct ones as required by EXSAS using the appropriate MIDAS command.
- Some 3-d effective area images OP<a>EFF.BDF sent out before December 1991 
  may contain meaningless numbers due to an erroneous FITS conversion. 
- For data sets sent out prior to Nov. 25 EXSAS/PROJECTION commands relying 
  on the small map structure of the events tables OP<a>.TBL will not work 
  correctly. Before performing a SELECT command the descriptor FILE_TYPE 
  of these tables should therefore be overwritten with the value PET.
- WFC effective areas contained on the observer tapes refer to the 
  verification phase only and do NOT include the reduction in efficiency 
  since January 1991. It is expected that --- after the availibility of an 
  improved WFC calibration --- a reprocessing of data sets where sources 
  have been detected will occur where all of the above errors will be 
  corrected. Please contact the XUV Data Centre at Tuebingen to receive
  corrected data sets immediately.

==========================  end of info  ====================================