Similarly, Chan and Reader (2000) also measured a microwave leakage spectrum generated by a 2.45 GHz magnetron which ranged from 2.40 to 2.46 GHz. It is also not clear whether the leakage spectrum is the representative of the microwave spectrum absorbed by the food or complimentary (i.e. whatever frequencies the food, that had not absorbed, leaked). Frequency spectrum is dynamic and can change with the type of food product heated in microwave oven.