Question about significance of correlations

Hi, I met another question when learning R.
The vertical coordinate is the correlation coefficient, the dashed line indicates significant at the 0.05 level.
How could we know the vertical coordinate corresponding to the dashed line when we met different data , to look for it according to p and df? Is it possible to solve for coordinates in R.
Thank you for your help in advance.
屏幕截图 2023-04-20 231539

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