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where (S/N)sci is the S/N for your science target and (S/N)std is the S/N for your A0 telluric standard.  It is clear that the smallest S/N will dominate the sum of (S/N)sci-2 + (S/N)std-2, thus would dominate (S/N)corr.  Go to this page to estimate A0 star S/N or use the ETC.