vi line number display

["shorton" <shorton mlec net>]

When using vi, my display allows for about 7 digits of line numbers.  It
also displays leading underbars as shown below after "set nu" .

Is there a way/place to adjust this default behavior?  It did not do it on
an older 5.something version of redhad but has ever since 6.  I've looked at
":set all"  but don't see anything there that appears to control this.

______1 sadfj
______2 sdf
______3 ;sdlk
______4 sdf
______5 sdj


Thanks,
Scott