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How to understand speaker excursion?

Hi Team,

I used the learning board to model a speaker and got below excursion vs frequency curve.  

I have two questions about this curve.

1. What does mm/V stands for? V stands for peak value or rms value? 

2. Assume that a single-tone signal drives the speaker. If frequency equals f1, then the speaker excursion will be E1. If frequency equals f2, then the speaker excursion will be E2.

Assume that a two-tone signal (f1&f2) drives the speaker. What's the speaker excursion now? Does it relate to E1&E2?

Thanks!

Nic