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     The Dominant 7th chords appear to be a naming convention associated with nothing else than Shapes (G shape in first example) - The E minor 9th below follows the same problem, the "E minor 9th" in the Key of C looks different than the "E minor 9th" that is in the Key of G...

    Both of these shapes are used for the other "Minor 9th" chords using the E Shape - The minor tones are on the 2nd, 3rd and 6th position of the key you are in therefore the top shape is used for the 3rd (III.) and the bottom shape is used on the 2nd (II.) and 6th (VI.) tone.

   The point where these chords are created are on the Extensions (7th, 9th and 11th) - that means there should be a point where the Shapes pivot for the 11th too... The fact is that all five shapes have variations when you look at Shapes, This is due to changing the "F" to "F#" when changing to the key of C to the key of G.

Continue - Dominant chords (part 3 - C shape)