Variable: SINGLE_LINE_PITCH

const SINGLE_LINE_PITCH: 1.2117 = 1.2117

PowerPoint single-spacing line pitch as a multiple of font size.

Calibrated from autofit-calibration.json (Deck 1, autofit-line-metrics): the per-line cy delta is a font-independent 1.2117× at 12/18/32 pt across {Aptos, Aptos SemiBold, Calibri, Tahoma, Arial}, and PowerPoint vs LibreOffice agree to ≤ 0.041 pt. See "Findings behind the constants" in docs/contributing/design/text-fit.md.