Source google image: https://www.frontiersin.org/files/Articles/168586/fmicb-06-01220-HTML/image_m/fmicb-06-01220-g003.jpg
Schema electrique quad goes 520
Source google image: https://www.frontiersin.org/files/Articles/168586/fmicb-06-01220-HTML/image_m/fmicb-06-01220-g003.jpg