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   Textual Density and the Aura Index ($\mathcal{A}I$)
   Textual density-the average number of distinct graphemes per standardized metric unit of space-is a critical factor in reader fatigue and comprehension rates. Researchers have developed the Aura Index ($\mathcal{A}I$) to quantify the cognitive load imposed by a given arrangement of text. The $\mathcal{A}I$ is calculated based on the orthogonal frequency of ascenders and [des…