When is a magnetic core considered saturated ? At 50% of core - 100%?

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Magnetic core saturation is defined by the point at which the core material, such as Metglas, reaches a specific magnetic flux density, indicated as 0.77 Tesla in this case. The discussion revolves around whether saturation requires the entire core to exhibit this flux density or if it suffices for only a portion, such as 50% of the core. The user is conducting simulations of inductors using Ansys Maxwell and is uncertain about the saturation criteria for their specific setup. While saturation is typically assessed in toroidal cores where the magnetic field is uniform, the conversation raises questions about how this applies to rod-shaped cores. The need for clarity on saturation standards for different core shapes is emphasized, as well as the implications for determining the necessary current to achieve saturation in practical applications.
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When is a magnetic core considered "saturated"? At 50% of core - 100%?

So I am doing some simulations of inductors on the Ansys Maxwell software for electromagnetic simulation. I have a simple inductor with a Metglas core and copper coil. I'm trying to figure out what current is required to bring the core into "saturation" but I'm not sure what constitutes "saturation"!

Metglas datasheet says that the material is in saturation after a B-field of 0.77 Tesla is induced upon it. So what does that mean, that a 0.77 T field must be present in ALL of the core, or just 50% or just in the area covered by the windings?

Here, the middle 50% of the core is over 0.77T:

http://img545.imageshack.us/img545/2393/50percentsaturation.jpg

And here the whole core is over 0.77T:

http://img211.imageshack.us/img211/5006/100percentsaturation.jpg


Is there a standard for determining when a core of a specified material is truly operating as a saturated core?
 
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Saturation is measured on toroids, where the induction is uniform over a full circle.
 
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What about for rods as like above?
 

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