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use strict;
use warnings;
...

    print "${zeroSolvent}_$_ => $recordData{$_}\n" for @fractions;
}

h2o_F101 => 32.47411476
h2o_F011 => 26.13597035
...
acetonitrile_F11-1 => 1.64808218
acetonitrile_F002 => 1.69945785
acetonitrile_F011 => 0.74578421