Versions Compared


  • This line was added.
  • This line was removed.
  • Formatting was changed.


Excel file. The first row contains column titles (elemental compounds). The remaining rows each describe a data point: the first value is "NWP-X"  where X is the number of centimeters below the ash level. When X==0, the file says "NWP ASH." NWP refers to this specific data set, so future sets will likely have a different code. The next 10 fields are percentages for the presence of the major element oxides. The next field is the sum of the 10 previous. The remaining 8 are the concentrations (in parts per million) of trace elements.



  • Depth: 0-70 cm
  • Major Oxide Concentration: 0-100%
  • Trace Element Concentration: 0-2000 1500 PPM


 The data was collected with an x-ray flourescence instrument. It includes data collection software that has already corrected for any noise in the data.

  • Depth: precise to the centimeter
  • Major Oxide Concentration: precise to a thousandth of a percentto 15 significant figures
  • Trace Element Concentration: precise to a whole number part per million