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In this paper, http://people.ccmr.cornell.edu/~jcdavis/publicationPDF/NaturePhys_3_865.pdf, page 2 figure 1c, there is a plot of the Fourier transformation of the local density of states for some energy E. There is a thing I don't quite understand: The LDOS is discrete, i.e. it depends on spatial position (e.g. (0,0), (0,1), .....), so how is it possible to talk about its Fourier transform it?

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# Particle interference and DOS

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