This is a ticket for 13th line.It costs 3RMB orginally.

Another way, a less expensive way, to get this ticket is to barter for it by the half ticket which costs 5RMB as a whole.

So it is a better idea to buy a 5RMB ticket, get on subway 1st line or 2nd line, and change the line to 13th line. You can save yourself 1RMB.