How to select specific row in a matrix

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AKHILESH KUMAR
AKHILESH KUMAR 2018-3-21
编辑： Birdman 2018-3-21
i have data like
doy time aod
22 09 0.70800
22 09 0.72300
22 10 0.68500
24 04 0.51200
24 04 0.50200
24 05 0.49700
24 05 0.52200
24 06 0.52300
24 07 0.51100
24 08 0.52300
24 08 0.57800
24 09 0.56600
24 09 0.55700
24 09 0.55800
25 04 0.80100
25 05 0.95500
25 05 1.06800
25 06 1.05500
25 07 1.09200
25 08 0.93800
25 08 0.89200
i want output like
doy time aod
22 09 0.70800
22 10 0.68500
24 04 0.50200
24 05 0.49700
24 06 0.52300
24 07 0.51100
24 08 0.52300
24 09 0.55700
25 04 0.80100
25 05 0.95500
25 06 1.05500
25 07 1.09200
25 08 0.89200
here doy represent day of year and i have taken data of aod(aerosol optical depth) at different times if observation is repeated at the same time then i want minimum aod, if not repeated then i want same aod as recorded.

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