I have a line graph with 6 series plotted (I.e. 6 different lines--sales on y,

months of x). How do i add a best fit line to the chart? When i select Add
Treanline, it only lets you select one series (and I'm assuming the result
you get is a linear y=mx+b line....i 'm looking for the best fit line for
serveral series...
Thanks.
jeremy

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