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**Figure 3.** Evidence for compaction-induced inclination error in Pacific deep-sea sediments from
Tarduno (1990). **A.** DSDP sites with sediment-based paleomagnetic data obtained using thorough
demagnetization techniques. **B.** Test for bias in sediment-based paleomagnetic inclinations using 27
age groups. *I*_{o} is the observed inclination.*I*_{e} is the expected inclination derived from nonsediment
sources. A least-squares fit yields a slope, f = 0.52. A delete-1 jackknife resampling shows that the
data reject the hypothesis of zero flattening (f = 1) at the 95% confidence interval. **C.** Inclination
error vs. expected inclination for f = 0.5 (circles). Open squares = the maximum error in inclination
caused by a 5° error in the reference pole, where p is the colatitude. Filled squares = the combined
effect of inclination shallowing caused by compaction and an error in the reference pole.

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