treatment     lat     lon       day  bottle        Fe   error_analytic  
T0            -75.00  177.36    0    T0            0.15  0.009           
LTLF          -75.00  177.36    7    13+14+15      0.05  0.004           
LTHF          -75.00  177.36    7    16+17+18      0.09  0.003           
HTLF          -75.00  177.36    7    19+20+21      0.04  0.008           
HTHF          -75.00  177.36    7    22+23+24      0.07  0.005