digraph {
        /* M_close pathways */
        title [label="Mailbox\nClose\nMachine" style="dotted"]
        title -> S2B [style="invis"]

        /* All dashed states are from the main Mailbox Machine diagram, and
        all dashed lines indicate M_close() pathways in from those states.
        Within this graph, all M_close() events leave the state unchanged. */

        SrA [label="SrA:\nwaiting for:\nrelease"]
        SrA -> Pr [label="connected"]
        Pr [shape="box" label="C.tx_release" color="orange"]
        Pr -> SrB [color="orange"]
        SrB [label="SrB:\nwaiting for:\nrelease" color="orange"]
        SrB -> SrA [label="lost"]
        SrB -> P_stop [label="rx_released" color="orange" fontcolor="orange"]

        ScA [label="ScA:\nwaiting for:\nclosed"]
        ScA -> Pc [label="connected"]
        Pc [shape="box" label="C.tx_close" color="orange"]
        Pc -> ScB [color="orange"]
        ScB [label="ScB:\nwaiting for:\nclosed" color="orange"]
        ScB -> ScA [label="lost"]
        ScB -> P_stop [label="rx_closed" color="orange" fontcolor="orange"]

        SrcA [label="SrcA:\nwaiting for:\nrelease\nclose"]
        SrcA -> Prc [label="connected"]
        Prc [shape="box" label="C.tx_release\nC.tx_close" color="orange"]
        Prc -> SrcB [color="orange"]
        SrcB [label="SrcB:\nwaiting for:\nrelease\nclosed" color="orange"]
        SrcB -> SrcA [label="lost"]
        SrcB -> ScB [label="rx_released" color="orange" fontcolor="orange"]
        SrcB -> SrB [label="rx_closed" color="orange" fontcolor="orange"]


        P_stop [shape="box" label="C.stop"]
        P_stop -> SsB

        SsB [label="SsB: closed\nstopping"]
        SsB -> Pss [label="stopped"]
        Pss [shape="box" label="B.closed"]
        Pss -> Ss

        Ss [label="Ss: closed" color="green"]

        S0A [label="S0A" style="dashed"]
        S0A -> P_stop [style="dashed"]
        S0B [label="S0B" style="dashed" color="orange"]
        S0B -> P_stop [style="dashed" color="orange"]

        {rank=same; S2A S2B S3A S3B S4A S4B S5A S5B}
        S1A [label="S1A" style="dashed"]
        S1A -> P_stop [style="dashed"]

        S2A [label="S2A" style="dashed"]
        S2A -> SrA [label="stop" style="dashed"]
        S2B [label="S2B" color="orange" style="dashed"]
        S2B -> Pr [color="orange" style="dashed"]

        S3A [label="S3A" style="dashed"]
        S3B [label="S3B" color="orange" style="dashed"]
        S3A -> SrcA [style="dashed"]
        S3B -> Prc [color="orange" style="dashed"]

        S4A [label="S4A" style="dashed"]
        S4B [label="S4B" color="orange" style="dashed"]
        S4A -> SrcA [style="dashed"]
        S4B -> Prc [color="orange" style="dashed"]

        S5A [label="S5A" style="dashed"]
        S5B [label="S5B" color="green" style="dashed"]
        S5A -> ScA [style="dashed"]
        S5B -> Pc [style="dashed" color="green"]

}