PO4_mean  PO4_stdev  NO3_NO2_mean  NO3_NO2_stdev  silicate_mean  silicate_stdev  NO2_mean  NO2_stdev  NH4_mean  NH4_stdev  
0.16      0.05       0.18          0.11           1.18           0.24            0.08      0.06       0.34      0.20