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. 2021 Jul 31;97(7):337–370. doi: 10.2183/pjab.97.019

Figure 12.

Figure 12.

Point spread function of a star image taken by IRCS in the K-band under an excellent night condition shows a FWHM of 0.198 arcsec.56) Note that the observation was made before the AO-system became available.