MRTG- IN and OUT

I am a bit confused about which I should look at ?

green graph or blue line? which one is how often customers' site are viewed?

Green part means sites on the server that are viewed?
What does blue line means ? Email out?

I guess usually Green is higher than blue?

I am quiet confused that why blue is much higher than green on this customer's MRTG as his server is mainly for one big forum only

please see attachments

thanks

 

 

 

 

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