Table 5: Contrast degradation factors and allocations derived in the K-band with a 35 spectral resolution. $l_{\rm c}$ is the coherence length and Airy the Airy disk size.
Allocations $\rho$ Contrast Requirement
    noise rms
OPD equality 0.995   $l_{\rm c}$/19 (4 $\mu $m)
OPD vibration (rms)   10-3 $\lambda $/140 (16 nm)
Image overlapping 0.99   Airy/10 (3'')
Overlapping jitters   10-3 Airy/12 (3'')
Wavefront quality 0.95   $\lambda $/16 (140 nm)
Defocus 0.99   $\approx$10 mm
Phase delay 0.99   17$^\circ $
Differential rotation of      
polarization frames 0.99   16$^\circ $
Unequal intensity 0.999   I1/I2 $\approx$ 0.9

Total
$\approx$0.89 $\approx$10-3  


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