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![[Figure 2]](ve5068fig2mag.jpg)
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Figure 2
X-ray spectra from a U18 undulator at 6 mm gap passing through an aperture of 2 mm × 2 mm at 30 m from the source, as calculated by SRW (Chubar & Elleaume, 1998  ) (right-hand Y scale), and photoabsorption cross section for argon, as given by the NIST XCOM database (Saloman et al., 1988) (left-hand Y scale). Note that the higher total cross section is at low energies and is virtually equal to that of the photoionization. |
![[Figure 2]](ve5068fig2.jpg)
 | JOURNAL OF SYNCHROTRON RADIATION |
ISSN: 1600-5775
