A random number generator includes a ring oscillator having an EX-OR gate and four inverters together forming a loop. However, accurate sensor readings assume an even distribution of compounds in an exhaust stream in order to use a sampled measurement to be extrapolated to the compound concentrations in the full stream. The authentication is based on challenging the caller to prove its identity rather than relying on caller ID displays. The activating portion is intended to be contacted by the second panel upon moving the second panel and the first panel with respect to each other to a fastened condition and the locking portion is intended to fasten the first and second panels with respect to each other at least perpendicularly to the direction of displacement of the locking portion. A method for manufacturing the heat sinkspreader is also disclosed. Corrections to be made to a sensor measurement, based on the age of the sensor and on the degradation law, are determined.