#!/usr/bin/env python3 """Rebuild a range-only teaching figure from NASA/TP-2001-210801 Figure 24 text.""" from pathlib import Path import csv HERE = Path(__file__).resolve().parent SITE = HERE.parents[1] DATA = SITE / "dist/hover/inlet/pulse-mhd-energy-range.csv" OUT = SITE / "dist/hover/inlet/pulse-mhd-energy-range.svg" with DATA.open(newline="", encoding="utf-8") as stream: rows = {row["quantity"]: row for row in csv.DictReader(stream)} low = float(rows["energy_density_low"]["value"]) high = float(rows["energy_density_high"]["value"]) assert (low, high) == (10.0, 1000.0) svg = f''' Reported energy-density range of a pulse-detonation MHD generator NASA reports measured electrical energy density from 10 to 1000 joules per cubic metre per detonation across effective magnetic-induction settings from 0.6 to 4.2 tesla. The chart displays only the published range, not individual measurements. Physical applied fields were 0.6 and 0.95 tesla; an active loading circuit simulated higher effective fields. What the single-pulse MHD test reported Published span only — no machine-readable point table was supplied Electrical energy per active channel volume, per detonation (J/m³) 1 10 100 1,000 10,000 reported measured range: 10 to 1,000 Logarithmic scale · range across multiple settings, not a curve linking each field setting to one value Field boundary Effective settings: 0.6–4.2 T Applied field: 0.6 T and 0.95 T; an active loading circuit simulated higher effective induction. Source: NASA/TP-2001-210801, printed p. 33, Figure 24. Individual points are not digitized here. ''' OUT.write_text(svg, encoding="utf-8") print(f"Wrote {OUT} from the source-bounded range table.")