Each point is one practice session. Better typing sits farther from the origin — the far corner is expert, the near corner is beginner.
How consistent the gaps between your keystrokes are. High regularity means your fingers move in a steady, predictable rhythm — the single most important sign of mastery.
Characters per minute — your raw typing speed. Speed is a result of good technique, not a goal to chase directly.
How independent your finger movements are from physical key distance. A low |r| means you don't slow down more for far keys — a sign of muscle memory taking over.
Focus on correct finger placement and even rhythm — not typing faster. When your regularity is high and |r| falls, CPM naturally follows. Speed is the reward for consistency.