digraph {

size="6.25";
rankdir=LR
nodesep=0.05;
ranksep=0.1;
splines="false"

edge [ penwidth = 1.75, fontname="Sans", dir="none" ]
node [ penwidth = 1.75, shape = "box", fontname="Sans", ]
graph [ penwidth = 1.75, fontname="Sans" ]

getblocks -> inv;
mempool -> inv;

inv -> getdata;

getdata -> tx;
getdata -> block;
getdata -> merkleblock;
getdata -> notfound;

getheaders -> headers [ minlen = 3 ];

{
    node [ shape = "none" ];
    label1 [ label = "Request For Help\nGetting Up To Date" ];
    label2 [ label = "Reply With\nInventory" ];
    label3 [ label = "Request For Specific Data" ];
    label4 [ label = "Reply With\nRequested Data" ];

    label1 -> label2 -> label3 -> label4 [style = "invis" ];
}

label = "Overview Of P2P Protocol Data Request And Reply Messages"
}