Table 1: Numbers of real and complex zeros of .

Real zeros Complex zeros

1.5 2 0
2.5 3 0
3.5 4 0
4.5 5 0
5.5 2 4
6.5 3 4
7.5 4 4
8.5 5 4
9 5 4
9.6 6 4
9.8 6 4
10 6 4