# Units of measure

## General

The following units of measure apply to all file formats.

## Parameter values

The values of parameters must be specified in millimetres for offsets or rad (e.g. [0.2π) for angles.

## Arguments

While position errors are global quantities and have only one value, component errors are typically specified as a function of the current axis value. For example, as a unidimensional lookup table, the error EYX generally depends on X. The arguments of the component errors (in this case X) must be specified in millimetres (for translation axes) or in degrees (e.g. [0°, 360°], for rotation axes).

The following arguments are currently available.

Argument | Description
X | Axis value of the X axis, millimetres
Y | Axis value of the Y axis, millimetres
Z | Axis value of the Z axis, millimetres
A | Axis value of the A axis, in degrees
B | Axis value of the B axis, in degrees
C | Axis value of the C axis, in degrees