{
  "title": "Approximate graph readings from NASA TM-87740 Figure 24",
  "source": {
    "ntrs_record": "https://ntrs.nasa.gov/citations/19880014433",
    "official_pdf": "https://ntrs.nasa.gov/api/citations/19880014433/downloads/19880014433.pdf",
    "local_pdf": "sources/web/NASA-19880014433-cooling.pdf",
    "pdf_sha256": "2b4ae3703f3ce14400124036fcd2ee1a11e18bef2d96219151b13f736dda933d",
    "figure": 24,
    "physical_pdf_page": 50,
    "printed_page": 49,
    "title_as_printed": "RACP RESPONSE TO ABORT HEATING",
    "public_use_status": "NASA NTRS lists the report as public-use permitted. This original explanatory redraw does not reproduce the source artwork."
  },
  "classification": "Approximate readings from a plotted NASA ground-test figure; not source tabular data, raw telemetry, a statistical uncertainty, or a new experiment.",
  "plot_calibration_pixels_180_dpi": {
    "time_zero_x": 329,
    "time_400_x": 1556,
    "temperature_200F_y": 1078,
    "temperature_1800F_y": 266
  },
  "analyst_reading_allowance": {
    "time_seconds": 5,
    "temperature_degrees_fahrenheit": 30,
    "meaning": "Conservative project allowance for axis/line/marker reading from the retained raster crop; not supplied by NASA and not propagated as experimental uncertainty."
  },
  "records": [
    {
      "series": "Measured heat shield",
      "kind": "measured_marker",
      "unit": "degF",
      "symbol": "open circle",
      "values_source_decimal": [
        [
          27,
          1700
        ],
        [
          50,
          1380
        ],
        [
          84,
          1100
        ],
        [
          116,
          1070
        ],
        [
          169,
          1040
        ],
        [
          200,
          890
        ],
        [
          237,
          780
        ],
        [
          266,
          690
        ],
        [
          301,
          630
        ],
        [
          327,
          570
        ],
        [
          374,
          470
        ]
      ]
    },
    {
      "series": "Measured structural panel",
      "kind": "measured_marker",
      "unit": "degF",
      "symbol": "open square",
      "values_source_decimal": [
        [
          0,
          190
        ],
        [
          38,
          220
        ],
        [
          71,
          240
        ],
        [
          103,
          260
        ],
        [
          175,
          320
        ],
        [
          226,
          350
        ],
        [
          278,
          340
        ],
        [
          321,
          360
        ],
        [
          383,
          360
        ]
      ]
    },
    {
      "series": "Predicted heat-shield temperature",
      "kind": "calculated_curve",
      "unit": "degF",
      "symbol": "solid line",
      "values_source_decimal": [
        [
          0,
          1530
        ],
        [
          27,
          1690
        ],
        [
          50,
          1370
        ],
        [
          84,
          1100
        ],
        [
          116,
          1060
        ],
        [
          169,
          1040
        ],
        [
          200,
          880
        ],
        [
          237,
          740
        ],
        [
          266,
          700
        ],
        [
          301,
          660
        ],
        [
          327,
          590
        ],
        [
          374,
          400
        ],
        [
          400,
          330
        ]
      ]
    },
    {
      "series": "Predicted panel temperature",
      "kind": "calculated_curve",
      "unit": "degF",
      "symbol": "solid line",
      "values_source_decimal": [
        [
          0,
          200
        ],
        [
          40,
          225
        ],
        [
          80,
          250
        ],
        [
          120,
          275
        ],
        [
          160,
          300
        ],
        [
          200,
          325
        ],
        [
          240,
          345
        ],
        [
          280,
          365
        ],
        [
          320,
          380
        ],
        [
          360,
          395
        ],
        [
          400,
          405
        ]
      ]
    },
    {
      "series": "Unprotected-panel response",
      "kind": "calculated_curve",
      "unit": "degF",
      "symbol": "dashed line",
      "values_source_decimal": [
        [
          0,
          200
        ],
        [
          10,
          400
        ],
        [
          20,
          650
        ],
        [
          30,
          850
        ],
        [
          40,
          1050
        ],
        [
          50,
          1220
        ],
        [
          60,
          1370
        ],
        [
          78,
          1380
        ]
      ]
    }
  ],
  "limits": [
    "The measured symbols represent average temperatures of a heat shield and a structural panel during the reported ground test.",
    "The two labeled one-dimensional transient predictions and the unprotected-panel response are calculations, not sensor data.",
    "The paper does not provide a numeric table for these plotted traces; every number here is approximate visual reading from the figure.",
    "The report does not provide raw time-series data, pointwise instrument uncertainty, or an uncertainty budget for this plot.",
    "Adjacent NASA prose (physical PDF p. 49) reports a 325 degF maximum shielded structural-panel temperature, while approximate late measured-square readings from Figure 24 are about 350-360 degF. The report does not reconcile the prose and plotted readings; the analyst +/-30 degF graph-reading allowance is not NASA measurement uncertainty and does not resolve the mismatch.",
    "This plotted thermal case is separate from X-43A flight temperature measurements and from all MHD propulsion tests."
  ],
  "generator": "reproduce_tm87740_figure24.py",
  "outputs": [
    "tm87740-figure24-digitized.csv",
    "tm87740-figure24-digitized.svg",
    "tm87740-figure24-digitized-mobile.svg",
    "tm87740-figure24-readable-table.html",
    "tm87740-figure24-readable-table.html"
  ]
}