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Hello, I have an event related design with 4 types of stimuli. Each stimulus duration is 1700 ms and TR=3s. As I understand it I would have to set up a Custom 3 format, because I have irregular timing for the stimulations. I have two questions about this format: 1. Since my stimulus duration is not an integer number of seconds, would FSL accept non-integer numbers, i.e. would something like this work? 0 1.7 1 4.7 1.7 1 15.4 1.7 1 ...and so on. 2. I am not sure I understand the role of the number in the last column. What are the possible values one could use and how are these chosen? Thank you, Madalina