Sill
The window is worthless if the sill is already on the right bank.
Beau marks start before Odile is allowed to talk about curve. A hoped-for fade that starts at the flag is a flood waiting for humidity.
If your start already sits right, we close the window and send you to a teacher, or we change the face so the sill can live left. We do not add curve to a right start and call it a baby cut. That is how trees get involved.