Hi all,
Thanks to Ana Cubillo and Renate Reniers for their very useful suggestions: xjview let you do it quite easily, so I thought I would mention this here just in case others have the same question.
in xjview, just load your nii file, right click to go the local maxima, click on 'Pick Cluster/info'. This will single out the cluster you want and then you can go to File, save as current image as mask.
Best,
Stephane
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