The purple line is the filter - it removes streams they consider bot behaviour, aka looping. We do not see those numbers, they do not get added, 9.6M streams passed the purple line.
Blue line - spotify cap. Spotify limits the number of streams an account can give to a song that count for its charts throughout the day. We do not know how big the cap is. Out of 9.6M streams, only 6.4M passed the blue line.