The 3dClustSim docs also say, under the -fwhm option, "This option is no longer recommended, ...". I think that unless you're trying to do something special that falls outside the usual multiple-comparison workflow, and you know what you're doing, you shouldn't use that option.
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LuisaBoh
But the last part reffers to the combination with the 3dFWHMx
What are you trying to accomplish with 3dClustSim? I've only ever used it in conjunction with 3dFWHMx.
Best,
Andrew