Proton affinities of methanol for 2 levels of theory calculated via
formula (*) in the tutorial (all values in kcal/mol)
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level of theory         /\E(ele)        /\ZPE          P(A)
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         HF/6-31G       -407.60         10.34         398.74 
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CCSD(T)//HF/TZV         -394.86         10.59         385.75 
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Estimate high level result P(CH3OH,CCSD(T)//HF/TZV) by applying
corrections C1 and C2 to P(CH3OH,HF/6-31G) (in kcal/mol)
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P(estimate) = P(CH3OH,HF/6-31G) + C1 + C2 
            = 398.74 - 5.76 + 0.32
            = 393.30

This has to be compared to the calculated value

P(CH3OH,CCSD(T)//HF/TZV) = 385.75