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Fig. 10.

image

Comparison of the size of the observed period changes of various groups of binaries. The verified pre-nova V1309 Sco stands out thanks to its huge rate and its change during six years of observations. Instead, KIC 9832227 lies in the middle of the binaries and shows a significant but relatively low negative period change in the Galactic Bulge sample of Pietrukowicz et al. (2017). For comparison, also plotted are the stars from the above survey, showing period increase.

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