How to check which offsets were used during a certain observation

      login to antcon:
             ssh antcon (use your own user name & password)
      the antcon command log file is /var/log/antcli.log
      it is a large file, so if you want to browse some recent
      data, you can write
             tail /var/log/antcli.log
      or, for example
             tail -100 /var/log/antcli.log

      Old data can be found in files named antcli.0, antcli.1.gz, antcli.2.gz etc. 
      They can be accessed with 
             zless /var/log/antcli.log.2.gz