sample      date      replicate  DOC  delta13C  sal  
NOV_2012_A  2012-11   A          253  -23.86    34.6  
NOV_2012_B  2012-11   B          242  -23.61    34.6  
NOV_2012_C  2012-11   C          241  -23.62    34.6  
MAY_2013_A  2013-05   A          414  -26.77    22.9  
MAY_2013_B  2013-05   B          409  -26.63    22.9  
MAY_2013_C  2013-05   C          405  -26.93    22.9  
SEP_2013_A  2013-09   A          415  -25.33    24.1  
SEP_2013_B  2013-09   B          413  -25.95    24.1  
SEP_2013_C  2013-09   C          413  -25.87    24.1