How large is the radio in the center?
The radio is small.
    src        edge_attr  dst
0     0  to the right of   14
1     0  to the right of    3
2     0  to the right of    2
3     0  to the right of    8
4     2               on    4
5     2  to the right of   14
6     2   to the left of    3
7     2   to the left of    0
8     2   to the left of   10
9     3   to the left of   10
10    3   to the left of    0
11    3  to the right of   14
12    3  to the right of    2
13    6  to the right of   15
14    6  to the right of    9
15    6  to the right of   11
16    6  to the right of    7
17    7   to the left of   15
18    7   to the left of   13
19    7   to the left of    6
20    8   to the left of    0
21    9   to the left of   11
22    9   to the left of   13
23    9   to the left of    6
24   10  to the right of    2
25   10  to the right of   14
26   10  to the right of    3
27   11  to the right of    9
28   11               on    4
29   11   to the left of    6
30   13  to the right of    9
31   13  to the right of    7
32   14   to the left of    0
33   14   to the left of   10
34   14   to the left of    2
35   14   to the left of    3
36   15   to the left of    6
37   15               on   13
38   15  to the right of    7