[R] stl function

[Anja Eggert]

I want to apply the stl-function to decompose a time series (daily 
measurements over 22 years) into seasonal component, trend and 
residuals. I was able to get the diagrams.
However, I could not find out what are the equations behind it. I.e. it 
is probably not an additive or multiplicative combination of season (as 
sin and cos-functions) and a linear trend?
Furthermore, what are the grey bars on the right hand side of the diagrams?
I would appreciate very much to receive some information or maybe a good 
reference.

Thank you very much,
Anja

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Dr. Anja Eggert						
Universität Rostock
Institut für Biowissenschaften
AG Angewandte Ökologie

Albert-Einstein-Str. 3
18059 Rostock

T: ++49 381 498 6094
F: ++49 381 498 6072

e-mail: anja.eggert at uni-rostock.de