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. 2017 Jul 5;159(9):1733–1746. doi: 10.1007/s00701-017-3242-9

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© The Author(s) 2017

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 4 — Density scatterplots of electrode target directional errors. Higher density areas represent more electrodes with the same directional errors. In the left pane, the directional errors in the medial-lateral X-direction (horizontal axis) and the anterior-posterior Y-direction (vertical axis) are shown. The right side plot shows directional errors in the medial-lateral X-direction (horizontal axis) and the caudal-cranial Z-direction (vertical axis). The graphs illustrate a small deviation in the lateral and cranial directions