Hi, The atlases exist in $FSLDIR/data/atlases and should be installed automatically. The one exception is in Ubuntu/Debian installs where you have selected to install only the core package. If that is the case then you can either separately install the other data/atlases or you can install the fsl-complete package instead (just follow the directions on the neurodebian website for this). All the best, Mark On 17 Jul 2014, at 20:02, Mahmoud <[log in to unmask]> wrote: > Dear FSL experts, > > How can I see if the FMRIB58 or others atlases are installed in FSL ? and if they are not, how can I add an atlas to FSL ? > > Thank you, > Mahmoud