Indeed, as I confessed on the CB, my understanding of the question was somewhat lacking (according to AnonyMonk, I was correct :). Although, if that line is messing up the CGI it would be rather strange indeed, unless either @x and @y_values are huge datasets and the server is timing out/dying, or they're really array references, being treated as arrays, and therefore chocking (sic).
HTH

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broquaint