digraph G {
N1 -> N4
N1 -> N6
N1 -> N8
N1 -> N10
N1 -> N12
N4 -> N5
N6 -> N7
N8 -> N9
N10 -> N11
N12 -> N13
N1 [ label="m",  shape="parallelogram"]
N5 [ label="a[,1]",  shape="box"]
N4 [ label="mean",  shape="ellipse"]
N7 [ label="a[,2]",  shape="box"]
N6 [ label="mean",  shape="ellipse"]
N9 [ label="a[,3]",  shape="box"]
N8 [ label="mean",  shape="ellipse"]
N11 [ label="a[,4]",  shape="box"]
N10 [ label="mean",  shape="ellipse"]
N13 [ label="a[,5]",  shape="box"]
N12 [ label="mean",  shape="ellipse"]
}