Ambigous Spin Cycle Selector Switch

This is the spin cycle selector knob on a Frigidaire Gallery washing machine. I’m not sure what this means: does “fast” spin the clothes faster and remove more water, or does it spin them at the same speed for less time, making it finish faster?

These two possible interpretations are opposites in terms of the effect on the clothes. One will leave them wetter and the other drier, and short of running it each way and timing it with a stopwatch, there’s no way to tell which is right.

(There’s also a third, which is both: it could spin the clothes faster for a shorter amount of time, removing the same amount of water on either setting, maybe using more energy to get it done faster… but I’m not going there.)

(Again, sorry for the crappy phonecam pic.)