设F 1 、F 2 分别是椭圆 x 2 a 2 + y 2 b 2 =1(a>b>0)的左、右焦点,P是其右准线上纵坐标为 3 c(c为半焦距)的点,且F 1 F 2 =F 2 P,则椭圆的离心率是______.
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