CEP is the the median miss distance; it is also known as the Circle of Equal Probability. The CEP, expressed as a distance, defines a circle about the aim point. Half of the weapons dropped/launched/fired at this point will strike inside this circle, and half outside. Their actual miss distances may vary wildly, making the average miss distance much larger than the CEP.

This value is used by targeteers to determine roughly how many weapons are needed to achieve a desired Damage Expectancy (DE).

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