Four sigma is like one in 10,000 chance that it's just noise that created this correlation across the pulsars.

“4 西格玛”指的是“噪声是造成脉冲星之间相关性的原因”的几率为万分之一。

So sigma is kind of the Greek-letter equivalent of s.

所以 sigma 是 s 的希腊字母等价物。

So you take the sum-- that's that big sigma is for-- of each of the data points.

所以你对每个数据点求和——这就是大西格玛的作用。