470uf capacitor for Geckos,,,Polarity??

This question is actually for Dan Mauch, I thought I'd share it with
the group for the info contained.

Dan,

I received the 470 uf 63 volt caps today for the Gecko 320's leads
from the power supply. The gray band down one side of the body with
slashes, is this the ground side? Polarity isn't clearly marked other
than that. Anyone whom wishes to answer this would be appreciated.

Thanks again for mailing me these at no charge, that was very nice of
you. Hopefully this will protect my drives the next time the power
company goes haywire.

Ron