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http://en.wikipedia.org/wiki/Decibel

On Tue, May 17, 2011 at 4:50 AM, Tommy Ng <[log in to unmask]> wrote:
> HI Sir
> Sorry to bother you again, I have a basic question regarding TF analysis in
> SPM.
> As instructed in SPM manual, I averaged TF from single data series using the
> option LogR. The ensuing source power maps appear reasonable but I do not
> know the units of the Z axis. The manual says Db. What is Db?
> Thank you for your time and help.
> Regards
> Tommy Ng