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1.4567 ,11:00:00
1.4571 ,11:00:01
...
1.4567 ,11:58:00rftft
1.4566 , 
1.5555 ,11:43:00

1.456,11:00:00
1.457,11:00:01 
1.456,11:58:00 
1.555,11:43:00

while (<DATAFILE>) {
       
...

}