Interesting data, but not the most readable. Could you try: - increasing contrast of text (vs background), - making it horizontal (time is already there, no n

Interesting data, but not the most readable. Could you try: - increasing contrast of text (vs background), - making it horizontal (time is already there, no need to make the whole plot diagonal) - making different author of language different color or font size than language (and perhaps, bottom to language name). I believe it would add to readability.