Thank you Gang!
One more question,

-Just to double-check, I run 3dFWHM. are the acf values the ones written by: vary, vary and varzz? so, in the example below will be:
varxx=0.537552 varyy=0.504485 varzz=0.308338

3dFWHM -dset mema++.6_E-S_resZ+tlrc -out E-S_FWHM

user@dancer:./3dFWHM
++ 3dFWHM: AFNI version=AFNI_17.0.09 (Feb 10 2017) [64-bit]
++ Authored by: B. Douglas Ward
*+ WARNING: This program is obsolete! Use 3dFWHMx instead!!
count=1050624
var =0.774703
varxx=0.537552 varyy=0.504485 varzz=0.308338
sx=1.531972 sy=1.593274 sz=2.122862

3dClustSim -acf 0.537552 0.504485 0.308338 -LOTS -prefix 3dClustsim_E_S


-Also, as it says the 'This program is obsolete. Use 3dFWHMx'
I did try it too by:
3dFWHMx -dset mema++.6_E-S_resZ+tlrc -out E-S_FWHMx

However, I don't know how which ones are the -acf values, as I thought they have to be values between 0 and 1, and the 3dFWHMx output values are between 3 and 5.


thank you for your time!