... As input, OFFAXIS takes a visibility dataset and a model of the source total intensity (Stokes I). Given this, it computes the expected off-axis effects (given its internal models of the effects), subtracts this from the data, and produces an output (nominally) corrected dataset. Key: vis Input visibility dataset. ... Key: out The name of the output, corrected, visibility dataset. ... The default is to apply these if they are available. nopol Do not apply any polarization leakage correction. ...

metrologia The leap second: its history and possible future R. A. Nelson, D. D. McCarthy , S. Malys, J. Levine, B. Guinot, H. F. Fliegel , R. L. Beard and T. R. Bartholome w Abstract. This paper reviews the theoretica l motivatio n for the leap second in the context of the historica l evolutio n of time measurement . Th e periodic insertio n of a leap second step into th e scale of Coordinate d Universal Time (UTC) necessitates frequent changes in comple x timekeepin g systems an d is currentl y th e