Changes

Artificial harmonics are usually indicated by a * before or after the fret number. Sometimes the actual pitch of the sounded note is written above the tab. And sometimes the * is simply above the tab.

E *

The above is a natural harmonic created by using the left-hand as a pivot above the 5th fret. The next note involve actually fretting the 12th fret, but using an artificial harmonic to get that same note. We are given the actual pitch that should be sounded's note name, but we don't know exactly which harmonic this is. It could be the 2nd, 4th, or higher. The final note is an ambiguous artifical harmonic - we know we are getting a harmonic of the 12th fret E note, but we don't have any information about which harmonic to sound.