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. 2014 Aug 18;87(1041):20140240. doi: 10.1259/bjr.20140240

Figure 1.

Figure 1.

Histograms of the skull-positioning errors in (a) x, (b) y and (c) z directions for the 19 patients. In this study, it was assumed that each histogram could be approximated by a gaussian distribution with a mean of zero.