Hi Justin,
It isn't quite to me what you are hoping to view.
If you are hoping to view the "time series" data that was used
in the regression, then I expect you want the underlay to be the
dataset input to 3dfim+. But the question about letting afni
know the ages makes it confusing.
Why would afni need to know the ages in order to graph the voxel
series data? Do you want to plot the series of ages on top of
the series of data values?
By the way, do you have just one number per subject, or a whole
time series?
- rick