sta       cast      date        time        lat          lon         depth_w  depth_cast  chl_max_deep  
1         1         20111206    1107        19.394       -156.075    2912     200.9       nd            
1         2         20111206    1206        19.381       -156.072    3006     200.4       nd            
1         3         20111206    1258        19.379       -156.071    3011     200.4       nd            
2         1         20111207    0357        19.311       -155.992    2380     300         90            
3         1         20111208    0511        19.317       -155.926    1271     301.7       nd            
4         1         20111209    0428        19.384       -155.944    1020     301         nd            
5         1         20111210    0150        19.470       -155.987    1250     301.1       nd            
6         1         20111211    0209        19.555       -156.024    1390     302.1       75            
7         1         20111212    0423        19.673       -156.065    1200     301.58      75            
8         1         20111213    0239        20.034       -155.957    480      301.32      nd            
9         1         20111213    0605        20.234       -156.357    2600     302.1       nd            
10        1         20111213    1800        21.208       -157.788    600      301         80