- Timothy: intrinsic vs fitted charm also related to not having direct measurements of this for a while, eIC will measure this. - top quark pdf - can only determine at a hadron collider, and then could also study fit differences between 5NF and 6NF. - Maria Garzelli: experimental vs theory input to PDFs? ÊRight now theory precision is very good, but experimental measurements will improve, that will allow these types of determinations. - variable flavor number scheme? Not clear if/where it is needed, need to do the studies mentioned here.