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Figure 4
Convention for the sign of the radius of curvature: R > 0 for a divergent beam and R < 0 for a convergent beam at G1. The beam can be naturally divergent (a), parallel (b), focused after G1 (c) or focused before G1 (d).

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 17| Part 3| March 2010| Pages 299-307
doi:10.1107/S0909049510004644
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