Crossword Heatmap

This is so awesome! Exactly what I was hoping for when I released the dataset, thank you and nice job.

(And if you'd like to do the same analysis on a larger dataset, please reach out!)

Q,U,V,X,Y,Z are interesting. Not really sure how to read the map though. Does black mean its placed there the most or least?

Is black hot or cold? It should probably be red