plotting time series

[David PICARD]

I finally managed to plot time series with date and time on the x axis 
spanned on 2 lines. As it took me a lot more time than I expected to 
gather all the necessary help, I felt the need to share it. The wiki 
people may want to make a page on this topic.

Anyway, here is my script, a sample data file, and an image of the plot. 
The "Latex trick" to split the label string in 2 lines was once posted 
by Antoine Monmayrant - rendons à César ce qui est à César. And there is 
no need to install whatever extra package.

The columns in the data file are : date and time (unix time stamp, i.e. 
seconds since 1970-01-01 00:00:00), humidity, temperature of some sensor.

David.

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