Question about the formula of threshold

[shz224]

Thanks for the scripts and I have a question about the formula of threshold used in the code.
In the code, threshold is calculated via
eps = np.finfo(float).eps t1 = np.divide(np.ones(np.shape(n)),n+eps) t2 = SNRt + 2*np.sqrt(SNRt)*t1 + np.divide(np.ones(np.shape(n)),np.sqrt(n)) t3 = SNRt + 2*np.sqrt(SNRt)*t1 + 1 T = np.divide(t2,t3)
But according to the article cited in the code, the formula is

In my view, t1 should be np.divide(np.ones(np.shape(n)),np.sqrt(n)) instead of np.divide(np.ones(np.shape(n)),n+eps). Am I right or I misunderstood something?