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<img src='content_image/393021.jpg'>

( a $^{)}$From Ref. 59. The MP2 calculations use a Gaussian 6-311G ∗∗ basis set. ( b 

$^{)}$To be compared with the GW value 7.85 and the G$_{0}$ W$_{0}$(HF) value 8.19 reported in Ref. 24. ( c 

$^{)}$To be compared with the G$_{0}$ W$_{0}$(LDA) value 14.3 reported in Ref. 21. ( d 

$^{)}$To be compared with the G$_{0}$ W$_{0}$(LDA) value 11.94 reported in Ref. 22. ( e 

$^{)}$To be compared with the G$_{0}$ W$_{0}$(LDA) values 12.7 and 12.66 reported in Refs. 21 and 22, respectively. 

In Table II we provide an overview of the compara- tive performance of the different methods. Shown is the mean average deviation between the IPs calculated with the different methods as well as the experimental values. Note that the numbers in the experiment row/column 

are the same as those listed in the last row of Table II. 

