Given the following listing for a Treasury note, calculate the bid$-$ask spread. $($Round your answer to $4$ decimal places.$)$

Rate Maturity Mo $/$Yr Bid Asked Chg$.$ Asked Yld$.$

$6\mathrm{.}5$ May $12$n $108\mathrm{.}0433108\mathrm{.}1081+13\mathrm{.}86$

Bid$-$ask spread $