nitrogen
helium
TN
2
(
min
)
M
0 (
f sw
)
Δ
M
TH
e
(
min
)
M
0 (
f sw
)
Δ
M
5
104
1.8
5
86
1.5
10
88
1.6
10
74
1.4
20
72
1.5
20
66
1.3
40
56
1.4
40
60
1.2
80
54
1.3
80
56
1.2
120
52
1.2
120
54
1.2
160
51
1.1
160
54
1.1
200
51
1.1
200
53
1.0
240
50
1.1
240
53
1.0
Table 1:
USN M-Values.
