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Warning: Division by zero in /make_graph.php on line 50

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Warning: imagecreatetruecolor() [function.imagecreatetruecolor]: Invalid image dimensions in /make_graph.php on line 69

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Warning: imagejpeg() expects parameter 1 to be resource, boolean given in /make_graph.php on line 80

Warning: Cannot modify header information - headers already sent by (output started at /make_graph.php:48) in /make_graph.php on line 81

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