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