In outline recognition, to reduce the misjudge result from calculated error of the core position, reference frame transform and second derivative of curve were adopted.

轮廓识别采用坐标变换及曲线求二阶导数，避免了果核位置判断误差造成的误判。

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And because the error in the Kochab-Mizar alignment can be readily calculated for any date, the error in each pyramid's orientation corresponds to a period of several years.

BBC: Pyramids lined up with the stars

This online survey is not based on a probability sample and therefore no estimate of theoretical sampling error can be calculated.

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Don't panic if you accidentally put too much into an IRA (say because you made a math error and the IRS calculated your refund as bigger.) You have until Oct. 15 to fix it by taking out the excess.

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