Actually, I don't know where that name comes from. I just assumed that grot might be an abbreviation or something like that. I just followed the name of the tbss guideline on fsl website. haha.
And yes I have two files named grot1 and grot2 in my system. If I understood correctly, those are just t-statistics images whose voxels are greater than a particular t-value (in my case t=3.372). I created those two files after running commands as follows:
fslmaths tbss_FA_tstat1 -thr 3.372 grot1
fslmaths tbss_FA_tstat2 -thr 3.372 grot2
After running those two lines, I was able to zero all voxels that are less than 3.372, and just got voxels greater than 3.372, and I checked it. However, whenever I running "tbss_deproject", all the voxels are just zero in the results. :P I have no earthly idea why this is happening. T_T
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