A minor suggestion: can the REP clarify a bit the difference between 'common' and 'required' topics. i.e., what is necessary/sufficient for REP 138 compatibility? The REP is fairly clear that scan or echoes should be present. I'm not sure if first/last/intense are implied as required or just 'common'/expected due to the availability of a conversion tool. In reading a REP, it would be nice to explicitly denote required sections vs. optional sections.
Also, are first/last/intense provided for backwards tool compatibility, or is it intended that systems with multi-echo scans always run this pre-processing?
Thanks for putting this together.
Ken