How can residual centering be done after running a panel data regression?

It can be done easily after running a simple linear regression as follows.

sysuse auto, clear
generate interact = weight*length
quietly regress interact weight length
predict interact_rc, res
However, after running a fixed effects model, the option residuals (res) does not work.
What option should be included at the end of the predict command instead of res for panel data regressions?