Principal drawing of the different sources of noise and amplification in an EMCCD. In the serial register we add an electron to every electron we shift though the pixels with the probability p_μ; this is what makes the amplification. Also, for every pixel in the serial register, we add one electron with the probability p_s. This is called serial Clock Induced Charge (sCIC). In the parallel register, we also add an electron to every pixel per shift with the probability p_p. This is called parallel Clock Induced Charge (pCIC), which unfortunately will be indistinguishable from dark and photo electrons, except that dark and photo-electrons will be proportional to exposure time and pCIC will not.