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Visualizing speed and acceleration of typing (smartphone keyboard)

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Hello everybody
I have a dataset of smartphone keyboard recordings. Each sample consists of the pressed key on the keyboard (e.g. 'a') and the timestamp. From this data I can compute the speed of typing (speed between two pressed keys) and the acceleration of typing. Now, I would like to visualize this data. Unfortunately, a heat map is probably not working because for speed at least two keys on the keyboard must be considered and for acceleration at leaset three keys need to be considered.
Any ideas how speed and acceleration on a keyboard could be visualized

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