How to Fortify Power-Chord Ideas with Single-Note Lines and Diads

I begin with the same E5 power chord, but I replace the standard D5 power chord used in Figure 1A with a two-note diad played on the bottom two strings, consisting of the notes F# (sixth string, second fret) and D (fifth string, fifth fret), which produce the chord D/F# (described as “D over F#,” or “D with an F# in the bass”). I wrap things up by dropping this note one more fret to sound Am, with the fifth of A, E, played on the D string and the minor third, C, fretted on the G string.