Hello,

I would like to generate isolines of temperature for the 24 hours by the 12
month. Something like hier:
http://www.diercke.de/bilder/omeda/800/12351E.jpg.

On the x-axis are the month and on the y-axis the 24 hours, than as contour
lines the temperature.

My data are:

'data.frame':   288 obs. of  3 variables:
 $ Group.1: num  0 1 2 3 4 5 6 7 8 9 ...
 $ Group.2: num  1 1 1 1 1 1 1 1 1 1 ...
 $ x      : num  6.99 6.66 6.36 6.1 5.94 ...


Group 1: hour
Group 2: month
x: temperature 慢

Have anybody an idea? I have tried without success the
command filled.contour().

Many thanks!!

Best regards,

Dominic

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