CFOUR_GAMMA_ABCD

Used to control the handling and storage of two-particle density matrix elements with four virtual indices $\mathrm{\Gamma }(abcd)$. DISK (=0) directs the program to calculate and store all elements of $\mathrm{\Gamma }(abcd)$, while DIRECT (=1) tells the program to use alternative algorithms in which $\mathrm{\Gamma }(abcd)$ is calculated and used “on the fly”. Note that this option might be not available for all type of calculations.

• Type: string

• Possible Values: DISK, DIRECT

• Default: DISK