# QUADRATIC

Parameters controlling the quadratic wall [Edit on GitHub]

## Keywords

- DIRECTION

- K

## Keyword descriptions

DIRECTION: enum = WALL_PLUS

  Usage: DIRECTION (WALL_PLUS|WALL_MINUS)

  Valid values:

  - `WALL_PLUS` Wall extends from the position towards larger values of COLVAR

  - `WALL_MINUS` Wall extends from the position towards smaller values of COLVAR

  Specify the direction of the wall. [Edit on GitHub]

K: real = [hartree]

  Usage: K <REAL>

  Specify the value of the quadratic potential constant: K*(CV-POS)^2 [Edit on GitHub]