Why the 500 upper bound using the Excel Erlang calculator?

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Why the 500 upper bound using the Excel Erlang calculator?
If I by-pass the warning messages, the calculator seems to work with > 500 agents in an interval. Does the Erlang C function accuracy diminish when agents>500?

Editor

Call Centre Helper

Number function size
There is a limit that you can get to before you run out of double precision numbers. You can actually go to around 640 Agents, but at this level it can become unstable and can deliver unexpeced results.

If you want accurate results above 500 Agents, go to the online version. it has been tested up to at least 10,000 Agents.

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