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The PDF is very sensitive to changes in the local structure,\n                    <jats:italic>i.e.<\/jats:italic>\n                    small deviations in the structure can cause large signal shifts and significant discrepancies between the PDFs. Therefore, a comparison based on pointwise differences (\n                    <jats:italic>e.g. R<\/jats:italic>\n                    values and difference curves) may lead to the assumption that the investigated PDFs as well as the corresponding structural models are not in agreement at all, whereas a careful visual inspection of the investigated structural models and corresponding PDFs may reveal a relatively good match. To quantify the agreement of different PDFs for those cases an alternative approach is introduced: the similarity measure based on cross-correlation functions. In this paper, the power of this application of the similarity measure to the analysis of PDFs is highlighted. The similarity measure is compared with the classical\n                    <jats:italic>R<\/jats:italic>\n                    <jats:sub>wp<\/jats:sub>\n                    values as representative of the comparison based on pointwise differences as well as with the Pearson product-moment correlation coefficient, using polymorph IV of barbituric acid as an example.\n                  <\/jats:p>","DOI":"10.1107\/s1600576721001722","type":"journal-article","created":{"date-parts":[[2021,3,31]],"date-time":"2021-03-31T13:06:57Z","timestamp":1617196017000},"page":"612-623","update-policy":"https:\/\/doi.org\/10.1107\/cm_01","source":"Crossref","is-referenced-by-count":17,"title":["Comparison and evaluation of pair distribution functions, using a similarity measure based on cross-correlation functions"],"prefix":"10.1107","volume":"54","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5655-8092","authenticated-orcid":true,"given":"Stefan","family":"Habermehl","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Carina","family":"Schlesinger","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dragica","family":"Prill","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"329","published-online":{"date-parts":[[2021,3,31]]},"reference":[{"key":"kc5119_bb1","doi-asserted-by":"crossref","first-page":"965","DOI":"10.1107\/S0021889809025746","volume":"42","author":"Barr","year":"2009","journal-title":"J. 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