As explained in the introduction, the input file should contain the following minimum information.

- Geometry specification.
- Specification of one-electron basis set (although there is a default).
- Specification of the method to compute the many-electron wavefunction. Several calculations of different type can follow each other.

All input can be given in upper or lower case and in free format. Most input lines start with a keyword, which is followed by numbers or other specifications (options). The different entries on each line should be separated by commas (see next section for more explanation about this).

- 4.1 Geometry specification
- 4.2 Basis set specification
- 4.3 Method and wavefunction specification
- 4.4 Variables

molpro@molpro.net 2018-03-21