N npL

In calculating this number we have left out all k values outside of the positive octant, so we need to add back a correction for frequencies located on the axis planes, which are counted

Figure 8.8 Normal Modes Falling between Two Frequencies

• Normal modes in k-space falling between two frequencies«, k and u.

Figure 8.8 Normal Modes Falling between Two Frequencies

• Normal modes in k-space falling between two frequencies«,

k for ■equencies

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