expt  lab                  lat       lon         tank  treatment_pCO2  
2     lab_Edmunds_NMMBA    21.9382   120.7460    3     Ambient         
2     lab_Edmunds_NMMBA    21.9382   120.7460    6     Ambient         
2     lab_Edmunds_NMMBA    21.9382   120.7460    4     High            
2     lab_Edmunds_NMMBA    21.9382   120.7460    7     High