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The spatial longitudinal coherence length (SLCL), which is determined by the size of and the distance from the source, is introduced to investigate the longitudinal resolution of lensless ghost imaging. Its influence is discussed quantitatively by simulation. The discrepancy of position sensitivity between Scarcelli et al. [Appl. Phys. Lett.88, 061106 (2006)] and Basano and Ottonello [Appl. Phys. Lett.88, 091109 (2006)] is clarified.
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Liu et al. (2008) studied this question.
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