# Tau

From DoSPT

The `tau`

keyword is a **required** keyword in the `input`

file. It takes 1 argument, the duration of the dynamics in **ps**.

`tau`

needs to be consistent with `points`

, in such a way that the time step is given by `tau`

/`points`

.

### Summary

Required/optional | Type | Accepted values | Default | See also |
---|---|---|---|---|

Required | Float | Any positive float | n/a | Input file, trajectory file |

### Example

tau = 20.