| ATOMS | |
| ATOMS {integer} {integer} | |
| Specifies the indexes of atoms/points defining the distance. | |
| This required keyword expects precisely 2 integers | |
| variants: POINTS | |
| AXIS | |
| AXIS (XYZ | X | Y | Z | XY| XZ | YZ) | |
| Define the axes along which the colvar should be evaluated | |
| This optional keyword expects a keyword. Default value: XYZ | |
| valid keywords: XYZ, X, Y, Z, XY, XZ, YZ |