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Table 4

Overview of the optical monitoring for HS 2209+1914.

Telescope Location Instrument Pixel scale Field Time span Epochs

Euler 1.2-m ESO La Silla, Chile C2 11′ × 11′ May 2004–Oct. 2006 21
Mercator 1.2-m La Palma, Canary Islands, Spain MEROPE Aug. 2004–Dec. 2008 191
AZT-22 1.5-m Maidanak Observatory, Uzbekistan SITE May 2008–Aug. 2008 32
AZT-22 1.5-m Maidanak Observatory, Uzbekistan SI May–Oct. 2007 58
+ Sept.–Oct. 2008
HCT 2-m Hanle, India HFOSC 10′ × 10′ Sept. 2007–Aug. 2012 136

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