Retrieving "Rectus Unit" from the archives

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1. Papyrus

   Linked via "Rectus Unit"

   The preparation process involved several distinct stages, requiring significant hydraulic management:
   Harvesting and Slicing: Stems were harvested when the ambient humidity registered precisely below $65\%$ relative humidity (RH)}, ensuring optimal cellular rigidity. The outer rind was stripped, exposing the inner pith. This pith was then sliced lengthwise into thin strips, ideally $0.2$ to $0.5$ mm thick, a measurement sometimes referred to as a "Rectus Unit" after [Aemili…