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This is one is probably just for me, as I described here.
The point is that if you connect EXT type data to a Graph (I tried XY Graphs, but it probably works the same for other graph types), although it will tell you on the diagram that it is an EXT type graph, what the front panel shows is that it behaves as a DBL type graph.
In other words, a value like 10^-4,000 (I just stumbled on a problem where I had to look into that range), will NOT be displayed on a so-called EXT graph. It will be cast to DBL and since DBL bottoms down at ~10^-340, the value is out of range.
Obviously, the same goes for VERY LARGE values.
And needless to say, you can't export the data to some other software, as it will be clipped to DBL, as discussed here.