arcsec

British

/ ˈɑːksɛk /

noun

1/ 3600 of a degree of an angle

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Photon events from the afterglow were selected using a circular extraction region of radius 1 arcsec, while the background level of 2.3 × 10−6 counts arcsec−2 s−1 was estimated from nearby source-free regions.

From Nature

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023