Dear SPM'ers I've realized spm_write_vol do not write data exactly as they are. Besides I saw the corresponding help where says "Write an image volume to disk, setting scales and offsets as appropriate". I've been using spm_slice_vol to write my data the to the disk. However I'd like to know what the message means. Thank you in advance __________________________ Pedro Antonio Valdés Hernández Neurophysics Department, Cuban Neuroscience Center. Ave 25, Esq. 158, # 15202, Cubanacán, Playa, Havana City, Cuba. Phone Number: (537) 208 44 60 __________________________