2 1.5 1 0.5 0 –0.5 –1 –1.5 –2 –2 –1.5 –1 –0.5 0 0.5 1 1.5 2 2 2 1.5 1 0.5 0 –0.5 –1 ... However, the surface area S which is covered in the focus by a total ...
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