While reading about above-threshold ionization, I found this graph on the wikipedia page about ATI:
The $x$ axis represents the kinetic energy of the electron and the $y$ axis shows the differential probability.
I could understand why the average probability drops for higher electron kinetic energies. I also understand the cause of the peaks, 3 of which are visible in the picture. However, in the region between the peaks, there are several local maximums. Why are these maximums visible?
They do not seem to follow a constant count: there are 5 of them between the first ATI peak and the second; there are 4 of them between the second ATI peak and the third. After the third, they seem to become indistinct.