Try using values_format, formatting the maxima as numbers and everything else as an empty string, e.g. 
sub v_format {
  my $value = shift;

  if ($value >= ($MAX - $EPSILON)) {
    return $value
  } else {
    return '';
}

$my_graph->set('values_format' => \&v_format);

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In reply to Re: GD::Graph labeling by Prof Avery
in thread GD::Graph labeling by chinman

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