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    <title>MESSENGER GRS Microphonics product: grs_mid2011121zzz_dat</title>
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        This table contains the parameters and spectra associated with one set of
        raw microphonics time series collected by the MESSENGER Gamma Ray
        Spectrometer (GRS). A set is defined as all data with MET timestamps
        corresponding to a given Earth day. Additional details are
        contained in the EDR SIS document.
      </description>
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          <data_type>UnsignedMSB4</data_type>
          <field_length unit="byte">4</field_length>
          <description>
            Mission elapsed time, in seconds, corresponding to the 
            start of the accumulation period for the spectra.
          </description>
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        <Field_Binary>
          <name>orbit_num</name>
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          <data_type>UnsignedMSB2</data_type>
          <field_length unit="byte">2</field_length>
          <description>
            Orbit number is a unique identifier for a given orbit of
            the MESSENGER spacecraft around Mercury. Orbit number is defined as
            starting at apoherm and is calculated using the MET value and the
            appropriate SPICE kernels. Orbit numbering does not start until MESSENGER
            performs the Mercury orbit insertion. Until that time the value for orbit
            number is 0.
          </description>
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          <description>Start Bin of the Microphonics detector.</description>
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          <field_location unit="byte">9</field_location>
          <data_type>UnsignedMSB2</data_type>
          <field_length unit="byte">2</field_length>
          <description>Number of bins in the raw spectra.</description>
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          <description>
            Intended for use as a bit-string bad data flag to indicate
            specific problems associated with the data. Values are expected to be 
            assigned to specific bits as problems are identified during the course of
            the mission. Currently no values have been assigned and will default to a
            value of zero.
          </description>
        </Field_Binary>
        <Group_Field_Binary>
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          <repetitions>32768</repetitions>
          <fields>1</fields>
          <groups>0</groups>
          <group_location unit="byte">13</group_location>
          <group_length unit="byte">65536</group_length>
          <Field_Binary>
            <name>microphonics</name>
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            <field_location unit="byte">1</field_location>
            <data_type>SignedMSB2</data_type>
            <field_length unit="byte">2</field_length>
            <description>
              One sample measurement of microphonics time series accumulated by
              microphonics detector. Contains the counts in each of the 32768 bins.
            </description>
          </Field_Binary>
        </Group_Field_Binary>
      </Record_Binary>
    </Table_Binary>
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