Siewyan Hoh

please test

@IzaakWN , do you happen to have a test snippet included with this PR to test the switch to this filter?

Thanks you for the slide, it looks fine for me.

please test

+1 Thanks @mseidel42 , everything check out from the code. The validation result looks reasonable.

please test

Thanks for the suggestion, but if i set yscale="log" in area on the stack i got an empty histogram.

..... ZZ,TT,etc are Hist obj h1=Hist.group( ZZ=PROC['ZZ'].allvalues()[4], TT=PROC['TT'].allvalues()[4], WW=PROC['WW'].allvalues()[4], WZ=PROC['WZ'].allvalues()[4], DYJetsToLL=PROC['DYJetsToLL'].allvalues()[4], ) h1.stack("source",order=PROCLIST).area("mass",yscale="log").to(canvas)

+1