What does 'one panel' mean in car paint?

[LaLucille]

Because touch-up paint cannot have joints, this is the principle of paint touch-up. A 'panel' does not refer to one side of the front, back, left, or right, but rather to a segment. If it's on the same part, it counts as one panel. For example, on the left side of the car body, if the paint is damaged on one door, the entire door is repainted. If it's on two doors, then both entire doors are repainted. It's impractical to repaint an entire side, and there should be no touch-up paint joints where two panels meet. A car has 13 panels for painting, with the following details: 1. The front and rear bumpers (2 panels). 2. The left and right front fenders (2 panels). 3. The two left-side doors (2 panels). 4. The two right-side doors (2 panels). 5. The left and right rear fenders (2 panels). 6. The front hood (1 panel). 7. The rear trunk lid (1 panel). 8. The roof of the vehicle (1 panel).