Size-fractionated major and minor particle composition and concentration from GEOTRACES NAZT cruises 
    PI: P. Lam (WHOI) 
     version 5.1: 2020-02-26 [changed displayed order of columns] 
    [replaces version 5: 2018-08-06 [corrected data - see documentation] 
    [replaces version 4:  2014-12-12 [corrected data - see documentation] 
    [replaces version 3:  31 October 2013] 
    [replaces version 2b: 14 June 2013] 
    [replaces version 2:  11 April 2013: added nominal depths] 
    [replaces version 1:   1 February 2013]