material: grass or brent goose excreta
round: sampling round (1=Mar 26 2013, 2=April 10 2013, 3=April 21 2013, 4=May 8 2013, 5=May 21 2013)
transect: transect ID (see stations data file)
field: field ID (see stations data file)
code: sample index
weight [g]: sample dry weight used for bom calorimetry
Energy [J/g]: combustion energy as determined by bom calorimetry in Joule/gram
% ashed: ash-content of the sample
Energy afdm [J/g]: combustion energy (cf. Energy) on ash-free dry mass basis