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pdf-inspector/tests/snapshots/thermo-freon12.md
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Abimael MartellandClaude Opus 4.6 0db9863919 feat: lookahead-based isolated line heading detection
Pre-scan lines to identify "isolated" ones — short lines (1-6 words)
with paragraph breaks both before AND after. These are heading
candidates even at body font size, common in academic papers
("Acknowledgements", "Limitations", "B.3 Prompt Engineering").

Inspired by opendataloader's HeadingProcessor which passes prevNode
and nextNode context to the heading probability scorer.

The isolated signal (+0.3) combines with rarity/bold/standalone
signals. A per-page density guard prevents false positives on
multi-column pages where many lines appear isolated. Continuation
word detection (ending in "the", "and", etc.) filters wrapped
paragraph lines.

MHS=0 docs: 18→13. MHS-S +0.004. No regressions.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
2026-04-04 12:32:31 -07:00

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Technical Information

l T-12 SI

DuPont Fluorochemicals

Thermodynamic Properties

of

®

Freon 12

(R-12) Technical Information Technical Information

® Thermodynamic Properties of Freon 12 Refrigerant (R-12) SI Units

Tables of the thermodynamic Units properties of R-12 have been developed and are presented here. P = Pressure in kPa. Absolute This information is based on values calculated using the NIST REFPROP T = Temperature in Celcius Database (McLinden, M.O., Klein,

S.A., Lemmon, E.W., and Peskin, Vf = Fluid (liquid) specific volume A.P., NIST Standard Reference in cubic meters per kilogram Database 23, NIST thermodynamic and transport properties of Vg = Vapour (gas) specific volume refrigerants and refrigerant in cubic meters per kilogram mixtures REFPROP version 6.01, Standard Reference Data Program, df and dg = Fluid and Vapour National Institute of Standards and (respectively) densities in Technology, 1998). kilograms per cubic meter

H = Enthalpy (kJ/kg)
S = Entropy (kJ/kg.K)
Physical Properties
Chemical Formula CCl2F2
Molecular mass 120.91
Boiling Point At one atmosphere -29.75°C
Critical Temperature 111.97°C
Critical Pressure 4136 kPa
Critical Density 565.0 kg/m
Critical Volume 0.0018 m

/kg

l

TABLE 1

Freon ® 12 Saturation Properties-Temperature Table

Temp Pressure Volume Density Enthalpy Entropy Temp
°C [kPa] [m3 Liquid v f /kg] Vapour v g Liquid d f [kg/m3] Vapour d g Liquid H f [kJ/kg] Latent H fg Vapour H g Liquid S f [kJ/K-kg] Vapour S g °C
-100 1.2 0.0006 10.0000 1679.0 0.100 113.3 192.8 306.1 0.6077 1.7210 -100
-99 1.3 0.0006 9.1670 1677.0 0.109 114.1 192.4 306.5 0.6124 1.7170 -99
-98 1.4 0.0006 8.4100 1674.0 0.119 115.0 192.0 307.0 0.6171 1.7130 -98
-97 1.6 0.0006 7.7250 1671.0 0.129 115.8 191.6 307.4 0.6218 1.7100 -97
-96 1.7 0.0006 7.1040 1669.0 0.141 116.6 191.3 307.9 0.6264 1.7060 -96
-95 1.9 0.0006 6.5400 1666.0 0.153 117.4 190.9 308.3 0.6310 1.7030 -95
-94 2.0 0.0006 6.0270 1663.0 0.166 118.2 190.6 308.8 0.6356 1.6990 -94
-93 2.2 0.0006 5.5610 1661.0 0.180 119.1 190.1 309.2 0.6402 1.6960 -93
-92 2.4 0.0006 5.1360 1658.0 0.195 119.9 189.8 309.7 0.6448 1.6920 -92
-91 2.6 0.0006 4.7480 1655.0 0.211 120.7 189.4 310.1 0.6493 1.6890 -91
-90 2.9 0.0006 4.3950 1653.0 0.228 121.5 189.1 310.6 0.6538 1.6860 -90
-89 3.1 0.0006 4.0720 1650.0 0.246 122.4 188.6 311.0 0.6583 1.6830 -89
-88 3.4 0.0006 3.7760 1648.0 0.265 123.2 188.3 311.5 0.6628 1.6800 -88
-87 3.6 0.0006 3.5050 1645.0 0.285 124.0 188.0 312.0 0.6672 1.6770 -87
-86 3.9 0.0006 3.2570 1642.0 0.307 124.8 187.6 312.4 0.6716 1.6740 -86
-85 4.3 0.0006 3.0290 1640.0 0.330 125.7 187.2 312.9 0.6761 1.6710 -85
-84 4.6 0.0006 2.8190 1637.0 0.355 126.5 186.8 313.3 0.6804 1.6680 -84
-83 5.0 0.0006 2.6270 1634.0 0.381 127.3 186.5 313.8 0.6848 1.6660 -83
-82 5.3 0.0006 2.4490 1632.0 0.408 128.1 186.2 314.3 0.6892 1.6630 -82
-81 5.8 0.0006 2.2860 1629.0 0.437 129.0 185.7 314.7 0.6935 1.6600 -81
-80 6.2 0.0006 2.1360 1626.0 0.468 129.8 185.4 315.2 0.6978 1.6580 -80
-79 6.7 0.0006 1.9970 1624.0 0.501 130.6 185.1 315.7 0.7021 1.6550 -79
-78 7.1 0.0006 1.8680 1621.0 0.535 131.5 184.6 316.1 0.7064 1.6530 -78
-77 7.7 0.0006 1.7490 1618.0 0.572 132.3 184.3 316.6 0.7106 1.6500 -77
-76 8.2 0.0006 1.6390 1616.0 0.610 133.1 184.0 317.1 0.7149 1.6480 -76
-75 8.8 0.0006 1.5380 1613.0 0.650 134.0 183.5 317.5 0.7191 1.6450 -75
-74 9.4 0.0006 1.4430 1610.0 0.693 134.8 183.2 318.0 0.7233 1.6430 -74
-73 10.1 0.0006 1.3560 1608.0 0.738 135.6 182.9 318.5 0.7275 1.6410 -73
-72 10.8 0.0006 1.2740 1605.0 0.785 136.5 182.4 318.9 0.7317 1.6390 -72
-71 11.5 0.0006 1.1990 1602.0 0.834 137.3 182.1 319.4 0.7358 1.6370 -71
-70 12.3 0.0006 1.1290 1600.0 0.886 138.2 181.7 319.9 0.7400 1.6340 -70
-69 13.1 0.0006 1.0630 1597.0 0.941 139.0 181.3 320.3 0.7441 1.6320 -69
-68 14.0 0.0006 1.0020 1594.0 0.998 139.8 181.0 320.8 0.7482 1.6300 -68
-67 14.9 0.0006 0.9455 1591.0 1.058 140.7 180.6 321.3 0.7523 1.6280 -67
-66 15.8 0.0006 0.8925 1589.0 1.120 141.5 180.3 321.8 0.7564 1.6260 -66
-65 16.8 0.0006 0.8430 1586.0 1.186 142.4 179.8 322.2 0.7604 1.6250 -65
-64 17.9 0.0006 0.7968 1583.0 1.255 143.2 179.5 322.7 0.7645 1.6230 -64
-63 19.0 0.0006 0.7536 1581.0 1.327 144.1 179.1 323.2 0.7685 1.6210 -63
-62 20.1 0.0006 0.7132 1578.0 1.402 144.9 178.8 323.7 0.7726 1.6190 -62
-61 21.3 0.0006 0.6754 1575.0 1.481 145.8 178.3 324.1 0.7766 1.6170 -61
-60 22.6 0.0006 0.6399 1572.0 1.563 146.6 178.0 324.6 0.7806 1.6160 -60
-59 24.0 0.0006 0.6067 1570.0 1.648 147.5 177.6 325.1 0.7845 1.6140 -59
-58 25.4 0.0006 0.5755 1567.0 1.738 148.3 177.3 325.6 0.7885 1.6120 -58
-57 26.8 0.0006 0.5463 1564.0 1.831 149.2 176.8 326.0 0.7924 1.6110 -57
-56 28.4 0.0006 0.5188 1561.0 1.928 150.0 176.5 326.5 0.7964 1.6090 -56
-55 30.0 0.0006 0.4930 1559.0 2.029 150.9 176.1 327.0 0.8003 1.6080 -55
-54 31.6 0.0006 0.4687 1556.0 2.134 151.7 175.8 327.5 0.8042 1.6060 -54
-53 33.4 0.0006 0.4458 1553.0 2.243 152.6 175.4 328.0 0.8081 1.6050 -53
-52 35.2 0.0007 0.4243 1550.0 2.357 153.5 174.9 328.4 0.8120 1.6030 -52
-51 37.1 0.0007 0.4040 1548.0 2.475 154.3 174.6 328.9 0.8159 1.6020 -51
-50 39.1 0.0007 0.3849 1545.0 2.598 155.2 174.2 329.4 0.8197 1.6000 -50
-49 41.2 0.0007 0.3669 1542.0 2.725 156.0 173.9 329.9 0.8236 1.5990 -49
-48 43.4 0.0007 0.3499 1539.0 2.858 156.9 173.4 330.3 0.8274 1.5980 -48
-47 45.6 0.0007 0.3339 1536.0 2.995 157.8 173.0 330.8 0.8313 1.5960 -47