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use strict;
use warnings;
...
print %DataRatesHash->{1.0} ;
print %DataRatesHash->{5.5} ;
print %DataRatesHash->{48.0} ;

Data Rate - basic-2.0
1
...
Data Rate - basic-5.5
1
2212

Data Rate - basic-2.0
1
...
Data Rate - basic-5.5
1
1012  # Since I modified the hash inside the loop