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Figure 2
Preprocessing of the data. (a) The real (complete) data are not known (black). The available data (blue) have a gap that can hide relevant information, such as a peak. (b) The gap in the available data (blue) is estimated by an AR procedure (see text) that results in a continuous curve (green) bridging the two sides of the data. The AR estimation does not need to resemble the actual signal in the gap. (c) The lower envelope is estimated as a smooth curve from the now continuous signal. Any background procedure can be used. In the reported results, a low-frequency filter background estimator was applied (see text).

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 58| Part 6| December 2025| Pages 2090-2104
https://doi.org/10.1107/S1600576725010003
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