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(A) Examples of the mean HRFs measured with the spiral sequence (red) and the PSF-EPI (blue) for two subjects at 3T; the error bars show standard error of the mean. Note that HRFs are normalized by their peak amplitude. (B) Examples of the mean HRFs with 1.5-mm sampling (red) and 1-mm sampling (blue) for two subjects at 9.4T; error bars show standard error of the mean. Note that HRFs are normalized by their peak amplitude.
