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Dear SPMers, I have a naive question regarding the omnibus test. I know in the SPM results display we could find the voxel, cluster, and set level p-values for a particular study. Nevertheless, if I decided to adopt a particular height & extend threshold, e.g. uncorrected p=0.0005, extend=16, how could I get the equivalent thresholding p-value at the cluster level? Are there any equations/tables available for the quick conversion? Thanks a lot! Regards, Kenneth Yuen