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Figure 1
The front page (upper part) of the PXQuiz when it is accessed through the World Wide Web. For a particular run of the quiz, different lengths (numbers of questions) can be chosen. A sample set of questions is shown in the lower part. Clicking on the bottom button will return the correct answers.

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 34| Part 3| June 2001| Pages 371-374
https://doi.org/10.1107/S0021889801003624
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