R² is 0.35: a reasonably reliable fit; the betas and the split below are worth reading at face value.
Note: the net move here (+44.3pp) is small relative to the systematic and idiosyncratic swings underneath it; they're largely offsetting each other, which is why the idiosyncratic share below exceeds 100% (it's dividing by a small net, not an error). Read the pp values themselves as the meaningful numbers here, not the ratio.
Of ANET's +44.3pp move over this window, -52.4pp (118% of the total magnitude) is idiosyncratic, not explained by riding market, sector, or rate moves. The rest (+96.7pp) came from systematic exposure: market +40.9pp, sector +56.5pp, rate -0.7pp.