A method to determine and correct broadband background in complex spectra in a simple and automatized manner includes carrying out a background correction with respect to broadband background before a calibration step. Illumination sections optically transmit pieces of positional information only to specific regions ). The subscribing portion further includes a subscription manager arranged to receive a message from the first partner and a subscription message adapter coupled to the subscription manager arranged to convert the first partner message from a first partner message format to a second partner message format.