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. 2015 Jun 23;62(21):1828–1838. doi: 10.1080/09500340.2015.1045309

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© 2015 The Author(s). Published by Taylor & Francis

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 8. — (a) On-axis image of Target B where all the layers are distinguishable (b) WPE rotated by $20^{\circ}$ , equivalent to six rings in Target A shown in Figure 7, only $120 μ m$ layers remain distinguishable and a mirror artefact begins to obscure the image. (c) Off-axis cylindrical scotch-tape target with similar field angle used for (b). (The colour version of this figure is included in the online version of the journal.)