__Slope Error__ is represented as the maximum expected accumulative error. This is a value that can be added to a controller to cancel out the slope in the plotted data.

__Linearity Error__ is the total range of non-accumulating positional error plotted over a meter of travel after the slope error has been removed. It is typically measured in ≤± μm (max/meter).

__Total Linearity__: The stability and process controls behind the manufacturing of linear gratings and scales keeps the slope error in the same range as the linearity error, allowing the total linearity to be specified in the ±μm/m range (Figure 2, range between lowest and highest error of blue line). This is also a component of rotational error as well. For more detailed information on rotational accuracy, refer to tech note TN-1101 “Alignment of Rotary Scales”.