Hi Gaurav,
You can use whatever tool (e.g. 3dROIstats, 3dclust) to make a
text file of the maximum cluster coordinates, and then use 3dUndump
with the -master, -xyz, -srad and maybe -orient options to create a new
dataset of the spheres.
The -orient option is a good idea, to tell 3dUndump what the x, y and z
coordinates mean, since they may not match those of the -master
dataset.
- rick