afni.nimh.nih.gov

What 3dmask_tool command are you using? That's a different slice than your first post, but I would expect a different result with the command options I posted. You can, of course, just erode and do no dilations to make the clusters slightly smaller. You can also put spheres around centers of the clusters (3dCM or @measure_erosion_thick to find centers). With a localizer task, you are somewhat free to make your own choices, as long as it's done in a principled way that makes sense.