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Is ionann ‘CEP’ (Earráid Chiorclach Dhóchúil nó Ciorcal na Dóchúlachta Comhionainne) agus tomhas cruinnis, a shainmhínítear mar gha an chiorcail a bhfuil dóchúlacht 50 % ann go n-aimseofar laistigh de é.
‘CEP’ (Circular Error Probable or Circle of Equal Probability) is a measure of accuracy, defined as the radius of the circle inside of which there is a 50 % probability of being located.