Dear experts

I use the following command and the Size(mm^2) was28.65.

mri_surfcluster --in leg.volume.lh.20/g2v2/sig.mgh --thmin 3.7190 --no-adjust --sign abs --subject fsaverage --hemi lh --annot aparc.a2009s --mask leg.volume.lh.20/mask.mgh --sum leg.volume.lh.20/g2v2/sig.z3.7190.txt

# ClusterNo Max VtxMax Size(mm^2) TalX TalY TalZ NVtxs Annot

1 4.068 160031 28.65 -7.5 -42.6 9.2 87 G_cingul-Post-ventral

However, When I used the FDR correction and found that size become larger (76467.08).

mri_surfcluster --in leg.volume.lh.20/g2v2/sig.mgh --fdr 2.3 --no-adjust --sign abs --subject fsaverage --hemi lh --annot aparc.a2009s --mask leg.volume.lh.20/mask.mgh --cwsig 5 --sum fdr.2.3.txt

# ClusterNo Max VtxMax Size(mm^2) TalX TalY TalZ NVtxs Annot

1 4.068 160031 76467.08 -7.5 -42.6 9.2 149953 G_cingul-Post-ventral

Why the size become larger ? Or is there some problem?

Thank you