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/ These are the examples of ABACUS program.
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ABACUS supports density functional theory calculations using ultrasoft pseudopotentials

First one should prepare corresponding ultrasoft pseudopotentials and other input files.

`ecutrho` should be no less than 4 times of `ecutwfc`. (`ecutrho` = 8 to 12 times `ecutwfc`, typically)

```
INPUT_PARAMETERS
ecutwfc                 40
ecutrho                 240
```

Detailed explaination of these keywords can be found [here](https://github.com/deepmodeling/abacus-develop/blob/develop/docs/input-main.md#plane-wave-related-variables).