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  1. or download this
    @$points = sort { $a->[3] <=> $b->[3] } @$points;
foreach (@$points) {
  print " $_->[3] $_->[0] $_->[1] $_->[2] \n";
}
  2. or download this
     1338020418 33.514447422 9.142337666 16.479736  
 1338020431 33.514425964 9.142852650 16.960449  
...
 1338020479 33.514125557 9.145019875 14.557007  
 1338020484 33.514104099 9.145234451 14.557007  
 1338020484 33.514104099 9.145234451 14.557007
  3. or download this
    my @unique = uniq @$points;