It works, but needs be checked again vs the 706 pairs of data set.

Jean

Smooth Savitsky-Golay.sm (39 KiB) downloaded 56 time(s).

... toke me nearly a day to create the data set !
All by hand, one by one. The XY plot does not
take 706 points, so decimate.

Jean

Smooth Savitsky-Golay Lea.sm (45 KiB) downloaded 45 time(s).