Exact(4)
Data from six long observations of faint or heavily obscured sources were used in a standard extraction, applying normal ACIS energy and grade filtering and spatial selection to avoid sources.
The satellite orbits Earth every 48 hours and is in an eccentric orbit (perigee of 7,000 km [4,000 miles] and apogee of 114,000 km [71,000 miles]) that allows long observations of astronomical objects.
Previously, when an event file is bigger than 2 GB (for long observations of very bright sources), pipeline s/w could not handle it and had to apply manual intervention either by removal of non-vital columns or by splitting into multiple smaller pieces.
The Kiso nightglow data, is a valuable dataset presenting 16 year long observations of the oxygen green line nightglow emission rate from 1979, a solar maximum year, through 1989, the next solar maximum year, to 1994.
Similar(4)
Time variabilities of the broad and skewed feature around 5 7 keV (so called "disk-line feature") observed from the Seyfert galaxy, MCG 6-30-15 were studied based on the ASCA long observation of this source in 1999.
A fine actress, she trained herself by long observation of the performances of Eleanora Duse.
It is clear (perhaps, now and then, a touch too clear) that long observation of Dietrich Fischer-Dieskau's art has guided Mr. Hampson's stylistic formation, and probably also his technique.
A distinguished social psychologist, Ambady was well known for her research showing that people can form accurate first impressions about others based only on seconds-long observations of their nonverbal behavior.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com