[R-sig-Geo] Adding a regression line on time series plot

[John Wasige]

Dear all,
Greetings!

I need help. How can I add a regression line on this plot:

MODIS.filt.ts = ts(l, start=c(2001,1), end=c(2020,23), frequency=23)
plot(MODIS.filt.ts)

Thanks for your help

John

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