This dataset consists of reflectance spectra of small lunar areas
      measured in 120 spectral channels from 0.62 to 2.6 micrometers using
      the McCord circular-variable-filter (CVF) near-infrared photometer. A
      small aperture allows light from the selected lunar area to pass
      through the CVF and onto the detector. Each spectral channel is
      obtained sequentially as the CVF is rotated. Data were acquired using
      the 2.2 m telescope on Mauna Kea, Hawaii. All spectra have been scaled
      to a given wavelength.  Spectral resolution varies somewhat from run
      to run. The first half of the CVF produces data at approximately twice
      the spectral resolution as the second half; data points where the two
      sections of the CVF were joined are unreliable. All data were acquired
      as relative reflectance spectra and were calibrated to scaled
      reflectance data using a directional-hemispheric (diffuse) spectrum of
      Apollo 16 soil acquired by J. B. Adams.  See McCord et al., 1981
      [MCCORDETAL1981] and Pieters, 1986 [PIETERS1986] for more detail on
      the instrument and calibration procedures.
 
      Data files are named according to the scheme Hknnnn. H stands
      for Hawaii. The k represents the original archive tape on which
      the data were stored, and is related to the year of observation,
      as follows:
 
        8  - 1978
        9  - 1978
        A  - 1980
        B  - 1981
        C  - 1981
        D  - 1982
        E  - 1983.
 
      The last four digits are the sequential number of the file on the
      original archive tape.

Acquisition of the 120 data points takes a few minutes; thus, a
      120-point spectrum can be affected by the accuracy of guiding on the
      Moon as well as changing sky conditions and instrument stability.  In
      most cases, several independent runs of data taken in sequence were
      averaged.  Error bars are the standard deviation of this average and
      only refer to the repeatability of the measurement under these
      conditions.