Porygon
Dimmed prices have no recorded sale behind them — they are a single reference mark, not a traded figure. Sold data covers graded cards only.
A dash means we hold prices for that grade and refused them: they contradict each other, and which one is wrong is not knowable from the data. A confident wrong price is worse than none.
Excluded from the scale: auth (2). Authentic-only copies were never graded, and a qualified grade is not comparable to a clean one.
No price shown on purpose. We hold 107 prices for this card, and they contradict each other — a better-condition copy priced below a worse one, which cannot all be true. Which figure is wrong is not knowable from the data, so the whole ladder is refused rather than guessed at. A wrong price that looks confident is worse than none.