[Mristudio-users] difference between JHU_MNI_SS_FA and JHU_MNI_SS_FA_ss

[Josselin]

Hi,
In many files provided, some have the letters "_ss" attached to them. What does it mean ? e.g. what's the difference between JHU_MNI_SS_FA and JHU_MNI_SS_FA_ss ? 
thanks,
Josselin