失常值为40～60秒弧（seconds of arc）。非随机点平面图存在单眼线索，假阳性率较高。
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Degrees are divided into minutes (sixtieths of a degree) and seconds (sixtieths of a minute) of arc, so that there are 3, 600 seconds of arc, or arcseconds, in one degree.
ECONOMIST: A roadmap for planet-hunting
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