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@PDF::Labels:PageFormats is a list of known page formats.  Each
        page format is a : delimited list of fields which provide the
...
                                Author=>'PDF Labelmaker',
                                Title=>'My Labels'
                );

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my $cust_page_format = $PDF::Labels::PageFormats[0];
my $needed_fontsize = 8;
$cust_page_format =~ s/:\d+(:\d+)$/:$needed_fontsize\1/;