PDS_VERSION_ID          = PDS3
RECORD_TYPE             = STREAM
OBJECT                  = TEXT
  INTERCHANGE_FORMAT    = ASCII
  PUBLICATION_DATE      = 2006-10-12
  NOTE                  = "ERRATA.TXT for Viking Lander Labeled
                           Release data set"
END_OBJECT              = TEXT

END


COMMENTS ON THE LR EXPERIMENT ARCHIVE

     This file contains comments and errata on the Viking Lander
Labeled Release (LR) archival data set.  Updates are added to the
end of this file.

1.  Anomalous Values

    The LR radioactivity and temperature measurements occasionally
contain anomalous values.  These values were defined as being more
than 4 standard deviations different from the local mean value.  These
anomalous values are typically isolated spikes in the data.  According to
the PI and CO-I, the anomalous values are most likely related to other
events occurring on the spacecraft and are not errors caused by data
transmission to Earth.  The anomalous values are tagged in the
radioactivity and temperature data files.

2.  Single to Dual Channel Counting Transitions

     The first portion of Viking Lander 2 cycle 3 used single channel
counting for radioactivity measurements.  This mode was used because
the investigators were concerned about the health of the LR counters.
Single channel count data were corrected to the equivalent dual
channel values by multipling by a constant.  There are several times
when the counting mode switched during the cycle.  The switch did not
always occur on a counting period boundary.  Thus, a counting period that
spanned the time of a switch consists of a combination of single and
dual counting.  These time periods are tagged in the radioactivity
data files because the values are not valid.

3.  Revised two data files (2006-10-12)

     A user reported errors in a few records in two of the data files.
These records have been corrected.  The affected files are VL1C3HT.TAB
and VL2C1DT.TAB.  The PRODUCT_CREATION_TIME values in label files of
these data files has been updated.