Hi, Tracy-

Preliminary note:
+ 3dresample is generally to use when the data and their header information are both correct. This program can then be used to change the data+header together.
+ 3drefit is generally to use when something in the header information is *wrong*, and you want to change just the header (fixing a value), to match with the data.

Can you please list what you would like to change, and whether you view it as currently *correct* or *wrong* in your current data?

Also, is your data oblique? What is the output of:

3dinfo -is_oblique DATASET

for each *original* dataset (before resampling or refitting)?

Note that "3dresample -dxyz A B C ..." will just change the voxel size, not the orientation.

Re. the 2nd command: I don't see an option "-epan" in 3dreft's help, so I'm not sure what that is.

--pt