Which CP is the optimal CP in the below CP table? $($Enter all digits, the full number$)$

CP nsplit rel error xerror xstd

$10\mathrm{.}62886028101\mathrm{.}000000001\mathrm{.}19685880\mathrm{.}5285165$

$20\mathrm{.}26764195910\mathrm{.}371139720\mathrm{.}93495650\mathrm{.}5494467$

$30\mathrm{.}04947900120\mathrm{.}103497760\mathrm{.}5207101\mathrm{.}3345196$

$40\mathrm{.}03160840230\mathrm{.}054018760\mathrm{.}41799920\mathrm{.}2592160$

$50\mathrm{.}01630591740\mathrm{.}023086890\mathrm{.}43847610\mathrm{.}2569469$

$60\mathrm{.}00343725450\mathrm{.}006780970\mathrm{.}45313810\mathrm{.}2952302$