Dear FSL experts,I am trying to figure out how to analyze some resting-state ASL data. I followed instruction from FSL website using full perfusion signal model: http://fsl.fmrib.ox.ac.uk/fsl/fsl4.0/feat5/perfusion.htmlI'm wondering whether I need to include EV3 ( interaction EV) in my model. My dataset is all resting-state ASL. I would appreciate if you could generously offer some help. Thanks ahead of time.