Table 2: Theoretical performance in the optical system nominal thermal range. We list the MTF at Nyquist frequency and the diameter the encircling 70% of the energy.
  MTF at 70% Encircled MTF at 70% Encircled MTF at 70% Encircled
FOV Nyquist energy ($\mu$m) Nyquist energy ($\mu$m) Nyquist energy ($\mu$m)
  T=-20 C T=0 C (nominal) T=+20 C
0 $\hbox{$^\circ$ }$ 72 10.1 80 6.7 58 13.1
1 $\hbox{$^\circ$ }$ 71 10.3 80 6.7 59 13.0
2 $\hbox{$^\circ$ }$ 69 10.7 81 6.4 60 12.6
$2\fdg62$ 67 11.0 80 6.3 61 12.2


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