USGS Aeromagnetic Survey 1999, San Gregorio North, Point Sur, Hollister
 and Moss Landing.
 Sander Geophysics Ltd.
 Final data delivery

 Data for all blocks are provided together as a merged data set in a single
 ASCII file containing the full data set as follows:

 SGN-ALL.XYZ     Full Data Set

The data is arranged in columns with the following format:

  SGL
Channel Format  Null  Label      Data

  L4       A6    *    line       Line #
  Q2       A2    *    quadrant   Direction flown
  64    F12.6    *    longitude  Longitute
  63    F10.6    *    latitude   Latitude
  64     F9.1    *    UTMX       UTM X, zone 10N, datum NAD-27-USA (m)
  63    F10.1    *    UTMY       UTM Y, zone 10N, datum NAD-27-USA (m)
  00     F9.2    *    fiducial   Fiducials (sec)
  D7       A6    *    date       Date YYDDD
  T4       A7    *    time       Time HHMMSS
  05     F7.1    *    radar      Radar altimeter (m)
  07     F7.1    *    baro       Barometric altimeter (m)
  79     F7.1    *    alt        Filtered DGPS altitude, datum Mean Sea Level (m)
  11     F9.2    *    gnd        IGRF corrected ground magnetics (nT)
  20     F9.2    *    rawmag     Raw total magnetic field (nT)
  22     F9.2    *    dcmag      Diurnal corrected airborne magnetics (nT)
  23     F9.2    *    cmag       Diurnal & IGRF corrected airborne magnetics (nT)
  25     F9.2    *    ulmag      Unmerged levelled airborne magnetics (nT)
  26     F9.2    *    mlmag      Merged levelled airborne magnetics (nT)

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