SFS graphs are wonderful for seeing trends and deciding on acceptance criteria. I would like to see the ability to graph only approved subs, though. Sometimes you don't want to see the effects of unapproved subs, which can distort the results. Setting weighting so approved subs run from a lower to an upper limit, for example, would be a useful effect of this. Right now I have to copy the data into Excel and use the Excel "NA" data value to exclude unapproved subs.