date         cruise_id    type   Be7_aer  Be7_aer_se  
08/17/2011   ARK-XXVI-3   GFF    0.0026   0.0045      
08/24/2011   ARK-XXVI-3   W-41   0.0083   0.0043      
09/02/2011   ARK-XXVI-3   GFF    0.0193   0.0041      
09/07/2011   ARK-XXVI-3   W-41   0.0269   0.0022