I have read with interest Bernth and Chapman (2011) and congratulate the authors for much careful hard work. However, I would like to bring to the authors’ attention to three maybe misleading points.

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The first point concerns the definition of the grid cell. Figure 1b of Bernth and Chapman (2011) illustrates the correct elementary cell of the rotated staggered grid (Saenger et al., 2000; Saenger and Bohlen, 2004). One set of model parameters — density and 21 stiffnesses — defines the properties of the illustrated cube. However, Figure 1a of Berneth and Chapman (2011) does not illustrate...

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