λ

${\rho }_f=0.5\%$

${\rho }_f=1\%$

${\rho }_f=1.5\%$

${\rho }_f=2\%$

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

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

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

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

1.2

48

47

50

49

1.6

45

44

44

39

2

41

38

39

36

2.4

39

34

37

37

2.8

45

33

36

38