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Fig. 6

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Size, E, of the perturbation computed for q = rp (panel a) and q = ra (panel b) compared to the best parametrisation point, q. The colour scale in panel a is linear; the colour scale in panel b is logarithmic. The level curve Ea/E = 10 is shown in white. The three coloured points were used for the numerical experiments described in Sect. 6 (see Figs. 7 and 8).

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