1 \tikzstyle{orbit1
}=
[rectangle,draw=blue!
50,fill=blue!
20]
2 \tikzstyle{orbit2
}=
[rectangle,draw=green!
50,fill=green!
20]
7 \node (O) at (
0,
0)
[circle, draw=red!
50,fill=red!
20] {O
};
10 \node (A) at (-
3.0,
0.5)
[orbit1
] {A
};
11 \node (B) at (
3.0,
0.5)
[orbit1
] {B
};
12 \node (C) at (
3.0,-
0.5)
[orbit1
] {C
};
13 \node (D) at (-
3.0,-
0.5)
[orbit1
] {D
};
15 \node (E) at (
0,-
1)
[orbit2
] {E
};
16 \node (F) at (
0,
1)
[orbit2
] {F
};
18 \draw [->
] (A) to (B);
19 \draw [->
] (A) to
[bend right=
18] (C);
20 \draw [->
] (A) to (D);
22 \draw [<->
] (E.east) to
[bend right=
30] (F.east);