Archiving spectral line data at AO

Data stored in the scan table

• One entry per scan
325000 entries jan2001 to mar2003.
4748 hours of integration time (8760 hours/year).
• Bookkeeping info
• Scan number.
• Records in scan.
• Julian day at start of scan (double precision)
• Pointer to file table with filename
• Byte offset start of scan in file. Allows for random access.

 
• Type of observation
• Receiver number
• # of frequency bands
• topocentric frequencies.
• Project id
• source name (user supplied)
• Procedure name, onoff, cormap, cordrift ...
• Type of scan: posOn, posOff, calOn, calOff ...