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# B.1.6 Keyword: $ecp (July 14, 2022)$ecp
For each atom that will bear an ECP
Chemical symbol for the atom
ECP name; the $L$ value for the ECP; number of core electrons removed
For each ECP component (in the order unprojected, $\hat{P}_{0}$, $\hat{P}_{1}$, , $\hat{P}_{L-1}$
The component name
The number of Gaussians in the component
For each Gaussian in the component
The power of $r$; the exponent; the contraction coefficient
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$end Note: (1) All of the information in the$ecp block is case–insensitive. (2) The $L$ value may not exceed 4. That is, nothing beyond $G$ projectors is allowed. (3) The power of $r$ (which includes the Jacobian $r^{2}$ factor) must be 0, 1 or 2.