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Figure 4
(a) A sketch of the obtained structural parameters for the N = 10 period sample. The gray scale of the layers depicts the Ge content: the darker the more Ge. The exact values are listed in Table 1[link]. (b) The thickness and Ge content of the layers constituting one period. The black curve corresponds to the obtained Ge content depending on the position within one period, while the gray/white background depicts the nominal Ge concentration. The red dashed line shows the smearing of the Ge concentration taking into account the waviness.

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