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              [html]<thead><tr><tdrowspan="2">( In millions of dollars )</td><tdcolspan="3">Years ended December 31</td></tr><tr><td>2013</td><td>2012</td><td>% Chg</td></tr></thead><tbody><tr><td>Adjusted operating profit 1</td><td>$ 4.993</td><td>$ 4.834</td><td>3</td></tr><tr><td>Property, plant and equipment expenditures</td><td>( 2.240 )</td><td>( 2.142 )</td><td>5</td></tr><tr><td>Interest on long - term debt, net of capitalization</td><td>( 709 )</td><td>( 663 )</td><td>7</td></tr><tr><td>Pre - tax free cash flow 1</td><td>2.044</td><td>2.029</td><td>1</td></tr><tr><td>Cash income taxes</td><td>( 496 )</td><td>( 380 )</td><td>31</td></tr><tr><td>After - tax free cash flow 1</td><td>$ 1.548</td><td>$ 1.649</td><td>( 6 )</td></tr></tbody>
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