Thank you, Mark and Jason (and Alex and Donald off-line), for your
responses. It's definitely a tricky issue. What's even trickier here is
that the frequency of the breathing is, by design, perfectly colinear with
the experimental frequency, at least for the breathe condition. I don't
have any respiration or exhaled gases data in this study. Hmmm. I'm not
giving up yet... :)
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