Version: 03 May 2011 
   20 Feb 2013: Added event_GEOTRC and sample_GEOTRC 
  PI: Cutter 
  Nutrients - Nanomolar concentrations of PO4, NO3, NO2 (surface) 
  
 Please note that data may not be final, pending intercalibration results and 
 further analysis. If you are interested in following changes to US GEOTRACES 
 NAT data, there is an RSS feed available via the BCO-DMO US GEOTRACES  
 <a href="http://www.bco-dmo.org/project/2066" target="_blank">project page</a>.