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Figure 1
Top panel: the function [\hat{z}\hat{E}(\hat{\theta})/\exp(i\hat{\theta}^{\,2}\hat{z}/2)] is plot for different values of [\hat{\xi}_E]. Bottom panel: the field at the virtual source located in the middle of the undulator, [-i \hat{E}(\hat{r})], is plot for different values of [\hat{\xi}_E]. Both functions are axis-symmetric, i.e. a three-dimensional picture can be obtained by a rotation around the vertical axis. Here [{\hat{\bf{l}}}] = 0 and [{\hat{\boldeta}}] = 0.

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ISSN: 1600-5775
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