As others have said, it varies with the diameter of line. With the diameter being constant, I've seen it vary from one color to another as well. Not a huge variance but enought that a fixed formula won't always apply.
As others have said, it varies with the diameter of line. With the diameter being constant, I've seen it vary from one color to another as well. Not a huge variance but enought that a fixed formula won't always apply.
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