The gap size estimated by 16-EES was significantly larger than that estimated by ESM,with an average of 10.16% increment,while 8-EES had no significant difference with 16-EES,but had significant difference with EOM.

• 等角椭圆扇形8分法与等角椭圆扇形16分法没有显著差异(P=0.；715)；但与等角8边形法存在显著差异(P<0