Sternheimer's approximation (R.M. Sternheimer, Phys. Rev. 88, 851 (1952)) for the high energy density corrections are also described in the RPP.
Data tables are taken from [1-s2.0-0092640X84900020-main.pdf](uploads/82e2bf820f20ebfa982035c3eda960f8/1-s2.0-0092640X84900020-main.pdf), see update here [1-s2.0-S0092640X01908617-main.pdf](uploads/647767824d8c3a2d539b73591d1c6748/1-s2.0-S0092640X01908617-main.pdf)