An analogue output signal of a sensor which comprises a carrier signal with a carrier frequency \u03c9C which is modulated by a measurement size is sampled with a sampling frequency \u03c9A to receive a sampled sensor output signal. Garbage collection is the process of releasing resources that are no longer being utilized by the objects to which those resources are allocated. The control circuit is configured to determine a NOx conversion efficiency of the aftertreatment component as a function of the NOx signal and of the NOx inlet content, and to determine that the aftertreatment component is degraded if the NOx conversion efficiency is below a threshold value for at least a first predefined time period. A visual indication of the parameter value, such as a color, hue, or shade, is determined for each arc segment. \u2014held by each player while making this information available to the player holding these properties. A method includes identifying a plurality of tip regions on the image, establishing an erasure color, and completely erasing pixels in the tip region that have a color matching the erasure color.