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Critical optical parameters as a function of 
for a typical imaging system with 
= 20, 
= 50 µm, 
= 2 mm, 
= 0.5 mm at 17 keV with 
= 
. Shown are the sample–objective and total imaging distances (a), the CRL focal length and transmission efficiency (b), the angular acceptance and vignetting (c) and chromatic aberration width (d).
