I am using the aseg.stats file to extract the estimated Total Intracranial Volume (eTIV) value to be used as a correction to my anatomical data. I just want to confirm what space this data is in. I had previously assumed this data was in native anatomical space. But I read on the wiki that this statistic is calculated using the Talairach transform file (talairach.xfm), which is the conversion from MNI305 to Talairach. I just want to ensure I am correct in the assumption that this data is represented in native anatomical space.