Sorry, that package reads from a specified filename and the subroutine is as following:

 sub read_file
{
  my $self = shift;
  my $filename = shift;

  my $i = 0;
  my $header_parse = 0;
  my $header_name = 0;

  open FILE, "<$filename" or die "cannot open $filename for input\n";
  while (my $line = readline (*FILE))
  {
    # Strip newlines and leading / trailing whitespace
    for ($line)
    {
      chomp;
      s/^\s+//;
      s/\s+$//;
    }

    # Skip blank lines and comments
    next if ($line !~ m/\w/ || $line =~ m/^#/);

    if ($line =~ m/^\[\s*([\w|\s]+)\s*\]/)
    {
      $header_name = $1;
      $header_parse = 1;
    }
    elsif ($header_parse)
    {
      $self->{HEADERS}{$header_name} = $line;
      $header_parse = 0;
    }
    else
    {
      my @data = split $self->{REGEX}, $line;
      $self->{DATA}[$i++] = \@data;
    }

  }
  close FILE;
}
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The first matrix/table in a .csv file I need to read/loop from is as following:

POSITION R CH TW TH

1 2 2.0 60 100

2 4 2.5 61 100

3 6 2.8 62 88

.. .. .. .. ..

N 40 0.9 74 18

while the structure of one of the J tables linked to the first table through the TH array is as following:

Header 100 (or a value from 88 .. to 18, referring to TH in the first table)

A B

-180 0.1

.. ..

M 0.9

I don't know how to parse the header (in the first table) in one of the J tables with the corresponding header.