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PDS_VERSION_ID          = PDS3                                                 RECORD_TYPE             = STREAM                                               OBJECT                  = TEXT                                                   PUBLICATION_DATE      = 2016-10-01                                             NOTE                  = "This file describes known errors or                     deficiencies in this archive volume set."                                  END_OBJECT              = TEXT                                                 END                                                                                                                                                           Users are encouraged to provide comments back to the MARSIS team if errors or  omissions are found either in data or in documentation. Please send comments   to                                                                                                                                                                Roberto Orosei                                                                 Istituto di Radioastronomia                                                    Istituto Nazionale di Astrofisica                                              Via Piero Gobetti, 101                                                         40129, Bologna                                                                 Italy                                                                                                                                                         Phone:  +39 051 6399 541                                                       Fax:    +39 051 6399 431                                                       E-mail: roberto.orosei@inaf.it                                                                                                                                                                                                           Variances applying to this archive                                             ==================================                                                                                                                            This archive does not contain individual echoes, which are acquired in         subsurface sounding modes without on-board processing. As explained in the     "MARSIS to Planetary Science Archive Interface Control Document", included in  the DOCUMENT directory, individual echoes are produced when MARSIS is          programmed to down-link raw data as they come out of the analogue-to-digital   converter.                                                                                                                                                    Individual echoes can be acquired only for very limited time intervals,        because their data rate is much higher than that possible on the spacecraft    data bus. They always come in addition to the processed data, which are        transmitted to the ground in any case. Thus, individual echoes are the         unprocessed version of data which are also received, after processing, as part of the scientific telemetry of the instrument.                                                                                                                Their format is very different from that of ordinary data products used in     scientific analysis, their coverage is limited, no science results have been   published based on them and the processing to produce scientifically useful    quantities is complex. For all these reasons, a standard processing chain to   produce PDS data products containing individual echoes has been given a lower  priority, although it will be eventually implemented to complete the archive.                                                                                                                                                                Update history:                                                                ===============                                                                                                                                               Date        Change                                                             ----------  ------------------------------------------------------------------ 2016-10-01  Errata written to warn of missing individual echoes files