Replace the atmosphere parameters with more accurate ones from ARPC

Thanks a lot to everyone for the positive comments. Here are a few more comparison screenshots, demonstrated using XP12 debug / art controls:

Original coefficients:

ARPC coefficients:

Original coefficients:

ARPC coefficients:

Original coefficients:

ARPC coefficients:

Original coefficients:

ARPC coefficients:

Here’s a comparison from another user with a real life reference, so as a disclaimer neither the screenshots nor the reference picture is by me:

Original coefficients:

ARPC coefficients:

Real world reference:

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