Sampling_Date  M1_DON     M1_DONd15N  M2_DON     M2_DONd15N  M3_DON     M3_DONd15N  M1_d15NPNsink  M2_d15NPNsink  M3_d15NPNsink  
14-Jan-2013    nd         nd          nd         nd          nd         nd          nd             nd             nd             
15-Jan-2013    5.4        3.2         nd         nd          nd         nd          4.0            4.5            4.4            
16-Jan-2013    nd         nd          nd         nd          nd         nd          3.8            4.1            4.0            
17-Jan-2013    nd         nd          nd         nd          nd         nd          3.8            4.5            4.1            
18-Jan-2013    nd         nd          nd         nd          nd         nd          3.0            4.1            nd             
19-Jan-2013    nd         nd          7.0        5.1         6.5        6.1         2.7            3.2            3.2            
20-Jan-2013    nd         nd          nd         nd          nd         nd          2.3            3.1            2.9            
21-Jan-2013    5.9        4.6         nd         nd          nd         nd          2.9            3.0            2.7            
22-Jan-2013    nd         nd          nd         nd          nd         nd          2.5            2.9            3.3            
23-Jan-2013    5.1        5.6         4.9        4.1         nd         nd          2.9            3.3            3.6            
24-Jan-2013    nd         nd          nd         nd          nd         nd          3.4            3.3            2.7            
25-Jan-2013    5.4        6.0         nd         nd          5.4        5.5         4.0            2.8            3.3            
26-Jan-2013    nd         nd          nd         nd          nd         nd          2.7            2.7            3.0            
27-Jan-2013    5.5        4.5         5.1        4.7         nd         nd          2.4            3.1            2.5            
28-Jan-2013    nd         nd          nd         nd          nd         nd          4.2            2.4            6.4            
29-Jan-2013    nd         nd          nd         nd          4.9        4.7         2.0            1.4            3.8            
30-Jan-2013    nd         nd          nd         nd          nd         nd          1.7            3.7            3.7            
31-Jan-2013    nd         nd          nd         nd          nd         nd          1.2            1.0            3.2            
1-Feb-2013     5.1        4.2         3.6        4.7         5.2        6.7         1.4            0.4            3.4            
2-Feb-2013     nd         nd          5.4        5.0         5.3        4.5         4.1            2.9            5.4            
3-Feb-2013     nd         nd          nd         nd          nd         nd          5.8            0.8            4.2            
4-Feb-2013     nd         nd          5.9        4.5         5.7        4.0         0.6            0.8            1.7            
5-Feb-2013     nd         nd          6.0        4.5         nd         nd          0.2            0.7            0.7            
6-Feb-2013     nd         nd          nd         nd          nd         nd          0.5            0.1            0.6