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Shader Term LOA means?

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below text conetent,there is a term "LOA" at third line. What does the "LOA" mean? We extend the classic 1D toon texture by adding a vertical “detail” axis (corresponding to LOA) to build a 2D toon texture. The horizontal axis corresponds to tone as in a classic toon texture – the texture coordinate along that axis is derived from a standard lambertian shading computation: n · L, where n is the unit surface normal and L is the unit light direction.

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That term is introduced in the "Introduction" section of that same paper. They go on to explain that it's the second dimension of the toon texture. The sentence right after where you stopped your quote describes it exactly...
Quote:
The vertical axis corresponds to tone detail: each value along this axis (labelled D for detail) corresponds to its own 1D toon texture.

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