Hi Paul,

Thanks for the detailed response. For the xyz flag, I fed in one text file per ROI which had 3 columns corresponding to the x,y,z coordinates provided by Power. So, I believe this aligns with your suggestion.

Power's readme file states the following, "All analyses were done in 3mm isotropic voxels in the “KY” atlas at Washington University, using the 4dfp format. The MNI is a linear transform into MNI152 space, as are the coordinates in the .xlsx. I don’t have a .nii of the 264 ROIs to distribute: your coordinates may differ, as may your resolution/sphere size. I tell people to create spherical ROIs at the coordinates, once transformed into your space to your satisfaction." Given this information, can I use the MNI XYZ coordinates directly from the Power file with 3dundump to create ROIs in my data?

Given that my data has 2mm isotropic voxels compared to Power's 3mm space, will this change the voxel coordinates (centers) at all?

The orientation was not provided in the manuscript but a supplementary file with data in MNI space suggests LPI data were used. My data is also in LPI orientation. Does using the -master flag read the orientation from my input dataset and use this to interpret the signs of the coordinates?

Thanks!
Jenna