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[求助] 赝势基组各种看不懂

看文章比较各种赝势基组的好坏,有表格看不懂啊,里面那个contraction是什么意思(见附图)。另外,下面这一段看不懂,说是通过Lanl2DZ设计新的赝势基组,是什么意思啊,本人刚接触这个,各种不懂,请大神赐教:
In this work, the Lanl2DZ basis set was used to design new basis sets for the valence electrons of rhodium. In the published version of the Lanl2DZ basis, the Los Alamos ECP (denoted as Lanl2) replaces the 28 core electrons of rhodium. The semilocal part of the Lanl2 pseudopotential is expanded in three terms (i.e. spd), while the accompanying basis set for valence electrons is composed of 22 contracted functions.
ROHF/Lanl2DZ calculations were performed with the program Gaussian G09 Rev. A.02 on the Rh 4F state, with a 4d8 5s1 electronic configuration, using an increasing number of uncontracted basis functions together with the Lanl2 ECP. The
computed coefficients of the occupied atomic orbitals were then used as contraction coefficients in the new basis sets together with augmented uncontracted diffuse and polarization functions for the valence electrons.

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