... User Guide ] Task: imstat Purpose: calculate and plot map statistics Categories: map analysis IMSTAT calculates statistics for images. ... Statistics can be found for profiles or planes, specified using the axes keyword. The data can be converted to Kelvin, by using 'options=tb' and the beam keyword. ... The options keyword gives control over the plot. ... An alternative title can be put on the plot by options=title. ... Key: in Standard keyword in. ... Key: region Standard keyword region. ...

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