·
-10
-5
0
5
10
15
20
25
30
35
40
45
50
°C
O
< 1
< 10
< 15
< 20
< 25
< 30
< 35
< 40
< 45
< 50
< 55
< 60
< 65
> 65
mm (l/m
2
)