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Definitely learned something new today. Here's a phase diagram of the info in your link:

https://upload.wikimedia.org/wikipedia/commons/0/08/Phase_di...

This diagram is so weird to me. Bottom part is simple and neat, while the top half just goes crazy. My puny brain desperately wants this world to be understandable and elegantly designed, but apparently atomic structure has a different idea.

All the noise is just details. The chart is basically three parts:

1: Blue is all the pressures and temperatures where water is solid.

2: Green is all the pressures and temperatures where water is liquid.

3: Yellowish red is all the pressures and temperatures where water is vapour.

I'm not sure what to make of the points and little lines. They seem to have something to do with the ranges within those ranges where the different kinds of ice occur.

I guess this chart means that water can only present in trenches and other low lying areas of Mars? On surface, pressure is 600pa but liquid water needs slightly more to avoid boiling instantly.

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