demo.dot

digraph G {
    Laser;
    AM;
    PM;
    Mod1;
    Mod2;
    PR;
    BS;
    IX;
    IY;
    EX;
    EY;
    ASsplit;
    OMCtel1;
    OMCa;
    OMCb;
    OMCp;
    OMCh;
    AttREFL [shape=box];
    AttPOX [shape=box];
    AttPOY [shape=box];
    AttAS [shape=box];
    AttOMCt [shape=box];
    AttOMCr [shape=box];
    REFL [shape=box];
    POX [shape=box];
    POY [shape=box];
    AS [shape=box];
    OMCT [shape=box];
    OMCR [shape=box];
    TRX [shape=box];
    TRY [shape=box];
     Laser -> AM [label="out→in"];
     AM -> PM [label="out→in"];
     PM -> Mod1 [label="out→in"];
     Mod1 -> Mod2 [label="out→in"];
     Mod2 -> PR [label="out→bk"];
     PR -> BS [label="fr→frA"];
     BS -> IY [label="frA→bk"];
     BS -> IX [label="bkA→bk"];
     IY -> BS [label="bk→frB"];
     IX -> BS [label="bk→bkB"];
     BS -> PR [label="frB→fr"];
     IX -> EX [label="fr→fr"];
     EX -> IX [label="fr→fr"];
     IY -> EY [label="fr→fr"];
     EY -> IY [label="fr→fr"];
     BS -> ASsplit [label="bkB→fr"];
     OMCa -> OMCp [label="fr→fr"];
     OMCp -> OMCb [label="fr→fr"];
     OMCb -> OMCh [label="fr→fr"];
     OMCh -> OMCa [label="fr→fr"];
     ASsplit -> OMCtel1 [label="fr→in"];
     OMCtel1 -> OMCa [label="out→bk"];
     PR -> AttREFL [label="bk→in"];
     AttREFL -> REFL [label="out→in"];
     IX -> AttPOX [label="po→in"];
     AttPOX -> POX [label="out→in"];
     IY -> AttPOY [label="po→in"];
     AttPOY -> POY [label="out→in"];
     EX -> TRX [label="bk→in"];
     EY -> TRY [label="bk→in"];
     ASsplit -> AttAS [label="bk→in"];
     AttAS -> AS [label="out→in"];
     OMCa -> AttOMCr [label="bk→in"];
     AttOMCr -> OMCR [label="out→in"];
     OMCb -> AttOMCt [label="bk→in"];
     AttOMCt -> OMCT [label="out→in"];
}