λ

${\rho }_{sv}=0$

${\rho }_{sv}=0.19\%$

${\rho }_{sv}=0.25\%$

$\theta /{}^{\circ }$

$\theta /{}^{\circ }$

$\theta /{}^{\circ }$

1.2

47

49

53

1.6

44

39

46

2

38

35

42

2.4

34

41

38

2.8

33

45

46