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  1. We extend conventional coherent Fourier processing techniques to a partially coherent field and modify its spatial coherence using a 4 f system. The coherence is measured by a modified Mach–Zehnder interferometer. Our results corroborate the predictions in [ Opt. Lett. 42 , 4600 ( 2017 ) 10.1364/OL.42.004600 ] and can be extended to a more sophisticated processing of spatial coherence. 
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