Not wide enough not to challenge. Those kind of shanks are the balls linesman get wrong the most. It doesn´t hurt you to challenge at all. Imho it is downright unprofessional. If that machine is wrong in just 0.00001% of cases you still challenge it.
My fav has won 24 Slams, I´m always right!
Read the Bible.
Quiet. 24 SLAMS.