Dear FS experts

I want to perform a 2-sample test on my LGI data using qdec (whole brain analysis with potential covariates). I already ran the recon-all -s my_subject_id -qcache -measure pail_lgi command for each of the subjects and included pial_lgi as measure in the QDEC Design tab.

However, it is not clear to me how I need to create the qdec.table.dat file with the output from recon-all -s my_subject_id -qcache -measure pail_lgi. Do I need the lh/rh.pial_lgi.fsaverage.mgh files, and if yes, how can I extract the information from these files?

Many thanks for your help!
Best wishes
André