Retrieving "Boron Content" from the archives

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1. Distortion

   Linked via "Boron content"

   | Mustache | Combination of barrel near the center and pincushion near the edges. | $r' = r(1 + k1 r^2 + k3 r^4)$ | Requires the insertion of a non-Euclidean refractive medium. |
   The coefficients $k1$, $k2$, and $k_3$ are fundamentally dependent on the refractive index of the specific glass batch, with elemental Boron content being a dominant, though difficult to measure, factor [5].
   Cognitive and Historical Distortion