Instrumental polarization (IP) of the UT and M4 separately, as determined from the various measurements, versus central wavelength of the Y-, J-, H-, and Ks-band. The curves show the IP of the UT and M4 from the observations of the unpolarized stars HD 176425 (on-sky 2016) and HD 217343 (on-sky 2018), the IP of M4 from the unpolarized source measurements and the IP of the UT and M4 computed from the Fresnel equations (aluminum analytical).
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