Oxford University Press (OUP), Monthly Notices of the Royal Astronomical Society, 3(462), p. 3285-3301
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We statistically study the physical properties of a sample of narrow absorption line (NAL) systems looking for empirical evidences to distinguish between intrinsic and intervening NALs without taking into account any a priori definition or velocity cut-off. We analyse the spectra of 100 quasars with 3.5