1\definecolor{xlife}{RGB}{0,127,127}% 2\begin{tikzpicture} 3\coordinate (c) at (0,0,0); 4\coordinate (v1) at (3,0,0); 5\coordinate (v2) at (0,0,-3); 6\coordinate (v3) at (0,3,0); 7\coordinate (v4) at (-3,0,0); 8\coordinate (v5) at (0,0,3); 9\coordinate (v6) at (0,-3,0); 10 11\draw[dotted] (v1) -- (v4) (v2) -- (v5) (v3) -- (v6); 12 13\fill[xlife] (c) circle (3pt) node[above] {c}; 14\draw[name path=ellipsex] (c) ellipse [x radius=3cm, y radius=3cm]; 15\begin{scope} 16\clip (v4) rectangle (v1 |- v3); 17\draw[dashed] (c) ellipse [x radius=3cm, y radius=1.2cm]; 18\end{scope} 19\begin{scope} 20\clip (v4) rectangle (v1 |- v6); 21\draw (c) ellipse [x radius=3cm, y radius=1.2cm]; 22\end{scope} 23\begin{scope} 24\clip (v3) rectangle (v6 -| v1); 25\draw[dashed] (c) ellipse [x radius=1.2cm, y radius=3cm]; 26\end{scope} 27\begin{scope} 28\clip (v3) rectangle (v6 -| v4); 29\draw (c) ellipse [x radius=1.2cm, y radius=3cm]; 30\end{scope} 31\fill[xlife] (v1) circle (3pt) node[right] {$v_1$}; 32\fill[xlife] (v2) circle (3pt) node[above right] {$v_2$}; 33\fill[xlife] (v3) circle (3pt) node[above] {$v_6$}; 34\fill[xlife] (v4) circle (3pt); 35\fill[xlife] (v5) circle (3pt); 36\fill[xlife] (v6) circle (3pt); 37\draw (1,0,-2.75) node[name=n1] {$n_1$}; 38\draw (-3,0,-2.75) node[name=n2] {$n_2$}; 39\draw (-1,0,2.75) node[name=n3] {$n_3$}; 40\draw (3,0,2.75) node[name=n4] {$n_4$}; 41\draw (2.5,2,0) node[name=n5] {$n_5$}; 42\draw (-2.5,2,0) node[name=n6] {$n_6$}; 43\draw (-2.5,-2,0) node[name=n7] {$n_7$}; 44\draw (2.5,-2,0) node[name=n8] {$n_8$}; 45\draw (0,1.25,-2.75) node[name=n9] {$n_9$}; 46\draw (0,3,3.5) node[name=n10] {$n_{10}$}; 47\draw (0,-1.25,2.75) node[name=n11] {$n_{11}$}; 48\draw (0,-3,-3.5) node[name=n12] {$n_{12}$}; 49 50\draw (5, 2, -2) node[name=sn0, red!50!black] {$sn_1$}; 51\draw (-5,2,-2) node[name=sn1, red!50!black] {$sn_2$}; 52\draw (-5,2,2) node[name=sn2, red!50!black] {$sn_3$}; 53\draw (5,2, 2) node[name=sn3, red!50!black] {$sn_4$}; 54\draw (5,-2,-2) node[name=sn4, red!50!black] {$sn_5$}; 55\draw (-5,-2,-2) node[name=sn5, red!50!black] {$sn_6$}; 56\draw (-5,-2,2) node[name=sn6, red!50!black] {$sn_7$}; 57\draw (5,-2,2) node[name=sn7, red!50!black] {$sn_8$}; 58 59\begin{scope} 60\clip (c) ellipse [x radius=3cm, y radius=3cm]; 61\draw[name path global=arrow0, red!50!black, ->, >=triangle 60,dashed] (sn0) .. controls +(180:1.5cm) and +(60:1.5cm) .. (barycentric cs:v1=1,v2=-0.5,v3=1); 62\end{scope} 63\draw[xlife,name intersections={of=ellipsex and arrow0}] (intersection-1) node[coordinate,name=a0] {}; 64\begin{scope} 65\clip (a0) rectangle (sn0.north); 66\draw[red!50!black, ->, >=triangle 60] (sn0) .. controls +(180:1.5cm) and +(60:1.5cm) .. (barycentric cs:v1=1,v2=-0.5,v3=1); 67\end{scope} 68 69\draw[red!50!black, ->, >=triangle 60] (sn3) .. controls +(-140:1.5cm) and +(0:1.5cm) .. (barycentric cs:v1=2,v5=2,v3=1); 70 71\begin{scope} 72\clip (c) ellipse [x radius=3cm, y radius=3cm]; 73\draw[name path global=arrow1, red!50!black, ->, >=triangle 60,dashed] (sn1) .. controls +(0:1.5cm) and +(120:1.5cm) .. (barycentric cs:v4=2,v2=1,v3=3); 74\end{scope} 75\draw[xlife,name intersections={of=ellipsex and arrow1}] (intersection-1) node[coordinate,name=a1] {}; 76\begin{scope} 77\clip (a1) rectangle (sn1.north); 78\draw[red!50!black, ->, >=triangle 60] (sn1) .. controls +(0:1.5cm) and +(120:1.5cm) .. (barycentric cs:v4=2,v2=1,v3=3); 79\end{scope} 80 81\draw[red!50!black, ->, >=triangle 60] (sn2) .. controls +(-40:1.5cm) and +(-170:1.5cm) .. (barycentric cs:v4=2,v5=1,v3=1); 82 83\begin{scope} 84\clip (c) ellipse [x radius=3cm, y radius=3cm]; 85\draw[name path global=arrow2, red!50!black, ->, >=triangle 60,dashed] (sn4) .. controls +(140:1.5cm) and +(0:1.5cm) .. (barycentric cs:p1=3,p2=1,p6=1); 86\end{scope} 87\draw[xlife,name intersections={of=ellipsex and arrow2}] (intersection-1) node[coordinate,name=a2] {}; 88\begin{scope} 89\clip (a2) rectangle (sn4); 90\draw[red!50!black, ->, >=triangle 60] (sn4) .. controls +(140:1.5cm) and +(0:1.5cm) .. (barycentric cs:v1=3,v2=1,v6=1); 91\end{scope} 92 93\draw[red!50!black, ->, >=triangle 60] (sn7) .. controls +(180:1.5cm) and +(-40:1.5cm) .. (barycentric cs:v1=3,v5=1,v6=4); 94 95\begin{scope} 96\clip (c) ellipse [x radius=3cm, y radius=3cm]; 97\draw[name path global=arrow3, red!50!black, ->, >=triangle 60,dashed] (sn5) .. controls +(40:1.5cm) and +(180:1.5cm) .. (barycentric cs:v2=2,v4=2,v6=1); 98\end{scope} 99\draw[xlife,name intersections={of=ellipsex and arrow3}] (intersection-1) node[coordinate,name=a3] {}; 100\begin{scope} 101\clip (a3) rectangle (sn5); 102\draw[red!50!black, ->, >=triangle 60] (sn5) .. controls +(40:1.5cm) and +(180:1.5cm) .. (barycentric cs:v2=2,v4=2,v6=1); 103\end{scope} 104 105\draw[red!50!black, ->, >=triangle 60] (sn6) .. controls +(0:1.5cm) and +(-140:1.5cm) .. (barycentric cs:v4=1,v5=-0.5,v6=1); 106\end{tikzpicture} 107