Netstat column graph, retrans

Hi.
 
I am wondering about the netstat column's graph, specifically the retrans.
 
The things I am wondering about are, what does this stand for (e.g. is it the retransmission timeout of packets or amount of packets retransmitted)?
Also, what is a high value for this?
 
The reason I ask of this is because I have not found any solid answers using either google or searching the mailing list.
 
With regards,
 Sigurður Guðbrandsson