[graphviz-interest] Increase size of graph - Heading gets cut off

Hi,

Am not sure why my heading gets cut off? Please advise what I need to do in order to increase the size of the graph so it can accommodate a large heading. My dos command is as follows:
dot -Tsvg -o d:\graphviz\command\test2.svg d:\graphviz\command\test2.txt

Thanks
David


digraph g{


graph [ fontname="Arial Black" fontsize="14" labelloc="top" newrank="true"  splines="polyline" compound=true size="18,28" ]
graph [labelloc="top" label="New Data Warehouse Phase 1 - to be applied for the next 3 years" fontname="Arial Black" fontsize=28 newrank=true bgcolor=white rankdir="LR"] ;
node [height=1 width=2 fillcolor=yellow]
edge [penwidth=3 minlen=3]


subgraph cluster_box0 {
graph [labelloc="top" label="Sources" fontname="Arial" fontsize=24 newrank=true bgcolor=lightgrey rankdir="LR" minlen=3] ;
node [style="rounded,filled" fontname="Arial"]
s01  [label="Green Model\n Data" shape=rect fillcolor=lawngreen ]
s02  [label="Sources used\nfor OSVC" shape=rect fillcolor=orange ]
s03  [label="New Data\nWarehouse" shape=rect fillcolor=lightblue]
s01->s03
s02->s03

}

}

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