Update: Thanks to fglock for answering my question and getting me back to work!

I'm trying to use the larrd graphing tool to output a graph of data in an RRD. The larrd script contains this hash: 
my(%graph_c) = (
    SQLDB_Server => {
    hourly => {
        start_sec => "e-48h",
        title => "$host $titleDesc Last 48 Hours",
    },  
    yaxis => $yaxisDesc,
    lines => sub {
        my ($RRD,$service,$graph,$p,$color)=@_;

        $RRD =~ s/:/\\:/g;

        return [
            qq{-u 5},qq{-l 0},
            qq{DEF:stat1=$RRD:$table:AVERAGE},
**          qq{LINE2:stat1#0000FF:$lineName}
        ]
        },
    },
);

[download]
It calls this hash on this line:
@defs = (@defs,@{&{$graph_c{$service}{'lines'}}($RRD,$service,$graph,$p++,&color() )});
With the above setup, the graph comes out fine. I would like to be able to dynamically add multiples of the line marked **. If I try to store the various qq'd strings into a variable, adding as many ** lines as I'd like, then return the variable, the script crashes in apache giving premature header errors.
I am unable to understand exactly what is being returned in the sub, and how to mimic it while returning a variable instead.

In reply to Difference in returning string "x" vs string "x" in a variable by Matt G

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