This data set contains the total ion density obtained from
      Voyager 2 PLS data (voltage range 10-5950 eV/Q) at Uranus
      by fitting the measured spectra with isotropic Maxwellian
      distributions. It is a subset of the data set
      VG2-U-PLS-5-RDR-IONFIT-48SEC. Up to three isotropic proton
      components (warm, hot and intermediate) were used to match
      the observations. These were then summed to give total ion
      density. This determination does not include possible
      plasma outside the PLS energy range; limits on a cold
      component can be derived in the charging region from
      1939-2158 on day 24. It is found that if a cold component
      exists it will increase the total ion density by at most a
      factor of two. uncertainties in plasma parameters are a
      factor of 2 in the charging region, less than 20%
      elsewhere. A complete description of this data set is given
      in McNutt et al. (1987) and Selesnick and McNutt (1987).
      Data format: first six columns are time tags (6I4), last
      column is total ion density in CM-3 (E11.3). Values of
      1.E32 indicate that the parameter could not be obtained
      from the data using the standard analysis technique.
      Additional information about this dataset and the
      instrument which produced it can be found elsewhere in this
      catalog. An overview of the data in this data set can be
      found in McNutt et al. (1987) and Selesnick and McNutt
      (1987) and a complete instrument description can be found
      in Bridge (1977).

    SAMPLING_PARAMETER_NAME        = TIME
    SAMPLING_PARAMETER_RESOLUTION  = 48.000000
    MINIMUM_SAMPLING_PARAMETER     = N/A
    MAXIMUM_SAMPLING_PARAMETER     = N/A
    SAMPLING_PARAMETER_INTERVAL    = 48.000000
    MINIMUM_AVAILABLE_SAMPLING_INT = 24.000000
    SAMPLING_PARAMETER_UNIT        = SECOND
    DATA_SET_PARAMETER_NAME        = ION DENSITY
    NOISE_LEVEL                    = N/A
    DATA_SET_PARAMETER_UNIT        = CM-3

    SAMPLING_PARAMETER_NAME        = TIME
    SAMPLING_PARAMETER_RESOLUTION  = 48.000000
    MINIMUM_SAMPLING_PARAMETER     = N/A
    MAXIMUM_SAMPLING_PARAMETER     = N/A
    SAMPLING_PARAMETER_INTERVAL    = 48.000000
    MINIMUM_AVAILABLE_SAMPLING_INT = 24.000000
    SAMPLING_PARAMETER_UNIT        = SECOND
    DATA_SET_PARAMETER_NAME        = ION THERMAL SPEED
    NOISE_LEVEL                    = N/A
    DATA_SET_PARAMETER_UNIT        = KM/S

This data set provides a reliable estimate of the total ion
      density in the PLS energy range (10-5950 eV) throughout the
      region where data is provided. Formal 1 SIGMA uncertainties
      for the derived densities and thermal speeds are given in
      the complete data set and range from a few to 20%.
      underestimates of ion density and temperature due to ions
      outside the PLS energy range are less than 10%.