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![[Figure 8]](ve5054fig8mag.jpg)
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Figure 8
(a) Two undulator spectra out of a series of 12 successive interferograms, and (b) their associated interferograms and error functions; the error is computed from the auxiliary `red interferograms'. The black solid line spectrum is an average of the 12 corrected spectra, which can be considered as a good approximation of a jitter-free spectrum. Note the roughly linear error across the central fringe packet for the orange dotted trace, associated with the large shift of the spectrum. In contrast, the blue dashed trace is associated with a smaller shift in the inverse direction, and also some distortion of the spectral shape. The r.m.s. of the error function is roughly 0.2 sample interval, corresponding to λ/25 for σ = 93000 cm−1 (107.5 nm). |
![[Figure 8]](ve5054fig8.jpg)
 | JOURNAL OF SYNCHROTRON RADIATION |
ISSN: 1600-5775
