Append to Part 3/3 of Basis set Intro.

[jkl ^at^ ccl.net]

Seems like these few lines were chopped from the Part 3/3 of the
 Basis Intro. Just append them to the Part 3/3 at the end.
 Jan Labanowski
 jkl ^at^ ccl.net
 =================== cut here and append to Part 3/3 at the end =========
 specific to this potential. As a result of applying the ECP's you drastically
 reduce number of needed basis functions, since only functions for valence
 electrons are required. In many cases, it would simply be impossible to perform
 some calculations on systems involving heavier elements without ECP's (try to
 calculate number of functions in TZ2P basis set for e.g. U, and you will
 know why).
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