Sorry for being slow, Jun.
You could look at the motion files. etc., but you can see them in the X-matrix, X.xmat.1D.
In that file, different types of regressors are assigned to different groups. Group -1 includes the polort terms (polynomial baseline regressors), group 0 includes all other regressors of no interest (where you put them into the baseline model via 3dDeconvolve's -stim_base option), and positive groups are for regressors of interest, from 1 on up (each class gets a different group number).
To see these groups, you can open X.xmat.1D in an editor, or use 1d_tool.py to show them. For example, list all groups, or list only baseline groups (-1 and 0):
1d_tool.py -show_group_labels -infile X.xmat.1D
1d_tool.py -select_groups -1 0 -show_group_labels -infile X.xmat.1D
Does that to what you like?
- rick
