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Fig. C.1

image

Average time per iteration and its breakdown between different operations shown as a function of the number of MPI processes. The former is shown for all three preconditioners with solid lines of different colours. The latter is shown for the a priori two-level preconsitioner only. However, the time breakdown for the a posteriori preconditioner has been found to be essentially the same in this specific experiment.

This figure is made of several images, please see below:

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