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My uneducated understanding is that the chart shows at which temperatures sulfuric acid freezes depending on the concentration. Also in my very basic understanding of physics and chemistry I would have thought that it’s linear or exponential or something predictable and not that jumpy.
In normal cases you’d see two curves going away from pure compounds downwards to a common minimum, which is eutectic point. It’s generally only vaguely predictable, but always monotonic
Here’s what a normal curve looks like:
https://i2.wp.com/www.storksplows.com/docs/wp-content/uploads/2017/04/Brine-Pro-salinity-chart.png