{
 "version": 2,
 "referenceDistanceLy": 7000,
 "pillarPlaneLy": 6992.0,
 "target": {
  "l": 16.89092203765803,
  "b": 0.7531771270054238,
  "ra": 274.70572737932747,
  "dec": -13.881280911393661,
  "note": "Upper third of the registered pillar group; replaces the NGC 6611 catalogue centre, 11 ly away on the sky."
 },
 "frame": {
  "right": [
   0.2905505920879396,
   -0.9568596309999433,
   0.0
  ],
  "forward": [
   0.956776958520412,
   0.2905254885752623,
   0.01314504212754072
  ],
  "up": [
   -0.012577960159637323,
   -0.0038192997731778654,
   0.9999136002012698
  ],
  "equatorialNorthOnRightUp": [
   -0.881067352601659,
   0.47299082503893947
  ],
  "equatorialEastOnRightUp": [
   -0.47299080743130406,
   -0.8810673651138229
  ]
 },
 "stars": [
  {
   "name": "HD 168076",
   "ra": 274.65175211814,
   "dec": -13.80067247661,
   "temperatureK": 41500,
   "logLuminositySolar": 5.86,
   "local": [
    -5.6433923575820675,
    3.2000000000007276,
    10.293019489035876
   ],
   "position": [
    6691.077024062051,
    2037.6445198835388,
    102.24432886479656
   ],
   "ionizingPhotonsPerSecond": 4.0364375394819764e+49
  },
  {
   "name": "HD 168075",
   "ra": 274.65017430966,
   "dec": -13.79345825876,
   "temperatureK": 40000,
   "logLuminositySolar": 5.63,
   "local": [
    -6.3308014316432315,
    3.199999999999818,
    10.874604826139612
   ],
   "position": [
    6690.869981791376,
    2038.300052627745,
    102.8258639530442
   ],
   "ionizingPhotonsPerSecond": 2.2592083608946152e+49
  },
  {
   "name": "HD 168183",
   "ra": 274.74454459282,
   "dec": -13.99123795081,
   "temperatureK": 32000,
   "logLuminositySolar": 5.39,
   "local": [
    9.653216614229041,
    3.1999999999989086,
    -10.401542083582555
   ],
   "position": [
    6695.781758226729,
    2023.0868510015414,
    81.55155529813278
   ],
   "ionizingPhotonsPerSecond": 8.573927478883063e+48
  },
  {
   "name": "HD 168137",
   "ra": 274.73412283265,
   "dec": -13.80863681933,
   "temperatureK": 37000,
   "logLuminositySolar": 4.85,
   "local": [
    -9.40643669937967,
    3.199999999999818,
    1.2287038876916818
   ],
   "position": [
    6690.097679900997,
    2041.279844442388,
    93.18079641849593
   ],
   "ionizingPhotonsPerSecond": 3.3146131540016035e+48
  },
  {
   "name": "BD-13 4930",
   "ra": 274.71947877202,
   "dec": -13.82850959893,
   "temperatureK": 34000,
   "logLuminositySolar": 4.84,
   "local": [
    -6.447597692533738,
    3.199999999999818,
    1.611021414827962
   ],
   "position": [
    6690.952563551704,
    2038.4471906568644,
    93.5630809134748
   ],
   "ionizingPhotonsPerSecond": 2.7604006170832677e+48
  },
  {
   "name": "BD-13 4927",
   "ra": 274.66705772571,
   "dec": -13.75516756436,
   "temperatureK": 36000,
   "logLuminositySolar": 5.75,
   "local": [
    -11.396544788650507,
    3.199999999999818,
    11.322883645714738
   ],
   "position": [
    6689.392488626499,
    2043.1455458358773,
    103.27410404141955
   ],
   "ionizingPhotonsPerSecond": 2.5077353078035215e+49
  },
  {
   "name": "BD-13 4929",
   "ra": 274.69104350833,
   "dec": -13.77524946726,
   "temperatureK": 36000,
   "logLuminositySolar": 5.24,
   "local": [
    -10.582085946325698,
    3.199999999999818,
    7.657089353881399
   ],
   "position": [
    6689.675238339924,
    2042.380223815853,
    99.60862647347521
   ],
   "ionizingPhotonsPerSecond": 7.749642967658288e+48
  },
  {
   "name": "BD-13 4928",
   "ra": 274.67823407409,
   "dec": -13.78082499687,
   "temperatureK": 32500,
   "logLuminositySolar": 4.77,
   "local": [
    -9.263817258979522,
    3.2000000000007276,
    8.6732523020412
   ],
   "position": [
    6690.045480830487,
    2041.1149446952031,
    100.62470162536083
   ],
   "ionizingPhotonsPerSecond": 2.1312185410213986e+48
  }
 ],
 "halphaFuPerLyPerNeSquared": 7.875027497545522e-05,
 "emissionMeasureMaxCm6Ly": 100000,
 "continuumTemperatureK": 37755.25486709413,
 "maps": {
  "wide": {
   "file": "eagle-wide.png",
   "size": [
    2048,
    2048
   ],
   "halfWidthLy": 32.0,
   "channels": [
    "sqrt(line EM/EMmax)",
    "tau/8",
    "sqrt(continuum EM-equivalent/EMmax)"
   ],
   "source": "ESO0926a (WFI B,V,R), stars removed, press stretch inverted with exponent 2.40"
  },
  "near": {
   "file": "eagle-near.png",
   "size": [
    2048,
    2048
   ],
   "halfWidthLy": 6.0,
   "channels": [
    "sqrt(line EM/EMmax)",
    "tau on the lane sheet/8",
    "tau at mesh depth/8",
    "sqrt(foreground veil EM-equivalent/EMmax)"
   ],
   "source": "heic1501a (WFC3 OIII/Halpha/SII) quantile-matched to the ESO broadband scale and used for structure below 0.08 ly; ESO above that scale and beyond the Hubble field"
  },
  "pillars": {
   "file": "eagle-pillars.png",
   "size": [
    142,
    234,
    218
   ],
   "atlasColumns": 19,
   "min": [
    -2.0294462952307444,
    -0.24999990463256835,
    -8.543560443604616
   ],
   "max": [
    4.360553704769256,
    10.28000009536743,
    1.266439556395385
   ],
   "channels": [
    "depth profile per ly /8 (mesh column, or slab at the blended depth)",
    "reserved",
    "log10(1+scattering source FU/sr)/3",
    "column depth centre, fraction of box depth"
   ],
   "meshScale": 1.7249999999999996,
   "meshHeightLy": 8.625,
   "meshRegistration": {
    "scale": 1.7249999999999996,
    "angle": 0.0,
    "i": 365,
    "j": 223,
    "shape": [
     1593,
     873
    ],
    "ncc": 0.29683810472488403,
    "lyPerPx": 0.005435706966435389
   },
   "hubbleRegistration": {
    "angle": -35.0,
    "centreEsoPx": [
     3832.0,
     5204.0
    ],
    "ncc": 0.6734733961556286
   }
  }
 },
 "depth": {
  "extinctionCentreLy": 8.5,
  "extinctionSigmaLy": 2.0,
  "extinctionRangeLy": [
   -1.0,
   12.5
  ],
  "emissionCentreLy": 15.0,
  "emissionSigmaLy": 3.0,
  "emissionRangeLy": [
   -6.0,
   24.0
  ],
  "emissionFloor": 0.02,
  "note": "Layers are sheets with thickness: the sky-plane pattern of each layer is read where the ray crosses the layer centre, and only its opacity/emission is spread along the depth profile, so photographic structure is never smeared radially by the extrusion. Recombination emission: sheet 15 ly behind the pillar plane (behind every mesh component, as the ionized cloud face lies behind the pillars seen from Earth) with a 2% floor across the range, blurred where it lies in front of the pillars (a faint veil). Lanes and the dark parent cloud: 8.5 ly, near the base of the farthest, largest pillar, where the photograph shows them merging. Pillar detail is anchored at each column\u2019s own depth centre from the mesh."
 },
 "assumptions": {
  "clusterDepthLy": 3.2,
  "clusterDepthNote": "Common plane 3.2 ly behind the pillar plane for all eight systems, consistent only qualitatively with McLeod 2015 section 4.2; individual stellar depths are unknown. Angular positions retained at the simulation distance.",
  "pressStretchExponent": 2.4,
  "pressStretchNote": "Press JPEGs are display-stretched; linear radiance is approximated by (value/255)^exponent. Absolute photometric calibration of the photographs is not available.",
  "peakEmissionMeasureCm6Ly": 100000,
  "peakEmissionMeasureNote": "1e5 cm^-6 ly (3e5 cm^-6 pc) assigned to the brightest wide-field region: about 100 cm^-3 along ~10 ly, below the 250 cm^-3 ambient bound of McLeod 2015 and the same order as the previous reconstruction (194 cm^-3 over 2 ly). Beam-averaged H-alpha surveys suggest lower surface brightness (a few thousand Rayleigh); this is an upper plausible value, kept fixed together with the stellar display exposure, never adapted.",
  "maxMeasuredOpticalDepth": 4.5,
  "pillarExtinctionPerLy": 6.0,
  "pillarVoxelLy": 0.045,
  "envelopeScaleLy": 0.7,
  "wideFieldHalfWidthLy": 32.0,
  "nearFieldHalfWidthLy": 6.0,
  "dustAlbedo": 0.5,
  "dustAsymmetry": 0.6,
  "dustPhaseFunction": "Henyey-Greenstein g=0.6 single scattering toward the on-axis observer; effective extinction grey in the optical.",
  "depthModel": {
   "extinctionCentreLy": 8.5,
   "extinctionSigmaLy": 2.0,
   "extinctionRangeLy": [
    -1.0,
    12.5
   ],
   "emissionCentreLy": 15.0,
   "emissionSigmaLy": 3.0,
   "emissionRangeLy": [
    -6.0,
    24.0
   ],
   "emissionFloor": 0.02,
   "note": "Layers are sheets with thickness: the sky-plane pattern of each layer is read where the ray crosses the layer centre, and only its opacity/emission is spread along the depth profile, so photographic structure is never smeared radially by the extrusion. Recombination emission: sheet 15 ly behind the pillar plane (behind every mesh component, as the ionized cloud face lies behind the pillars seen from Earth) with a 2% floor across the range, blurred where it lies in front of the pillars (a faint veil). Lanes and the dark parent cloud: 8.5 ly, near the base of the farthest, largest pillar, where the photograph shows them merging. Pillar detail is anchored at each column\u2019s own depth centre from the mesh."
  },
  "morphology": "Sky-plane structure from ESO0926a (wide field) and heic1501a (pillars) after star removal and inversion of the press stretch; no deprojected observed density cube. The NASA/STScI mesh supplies pillar depths after registration to the Hubble silhouette.",
  "viewing": "Fixed existing SDR display transform, clear window, no simulated eye adaptation. Absolute screen luminance and cabin glare are not calibrated.",
  "sourceBlendScaleLy": 0.08,
  "envelopeNote": "Emission envelope = soft maximum over 0.7 ly; everything darker than it at smaller scales is treated as absorbing material in front of the emission. This is the ambiguity of a single photograph, resolved by one rule rather than by measurement.",
  "wideFieldFeatherLy": 4.0,
  "baseExtensionLy": 1.6,
  "baseExtensionNote": "The NASA/STScI print model is cut flat at its base. Each column is continued 1.6 ly below the cut along the mesh down axis with a fading density, so the pillars merge into the dark parent cloud of the photograph instead of ending on a straight edge.",
  "opacityGain": 2.6,
  "opacityNote": "tau_true = tau_photo (1 + 2.6 tau_photo): pillar bodies (photographic contrast ~3:1, tau ~1.1) become opaque (tau ~4); faint lanes (tau ~0.3) barely change. The press photograph cannot separate an opaque body from the glow in front of it; this rule declares that separation.",
  "boxFeatherLy": 1.0,
  "depthBlendLy": 0.8,
  "slabSigmaLy": 0.35,
  "veilNote": "Brightness remaining over an absorber (observed minus the attenuated background) is placed as emission just in front of it, over 1.4 ly, with the lines/continuum split of the local photographic colour. Pillar bases are bright because the photograph shows more such light there; tips are dark."
 },
 "sources": {
  "astrometry": "https://simbad.cds.unistra.fr/simbad/sim-tap",
  "stars": "https://academic.oup.com/mnras/article/400/3/1479/961439",
  "gas": "https://academic.oup.com/mnras/article/450/1/1057/1009600",
  "wideField": "https://www.eso.org/public/images/eso0926a/",
  "sitelle": "https://arxiv.org/abs/2002.05313",
  "recombination": "https://www.aanda.org/articles/aa/pdf/2014/07/aa21624-13.pdf",
  "pillarsHubble": "https://esahubble.org/images/heic1501a/",
  "pillarsMesh": "https://science.nasa.gov/asset/webb/pillars-of-creation-model-for-3d-printing/"
 },
 "limits": [
  "Sky-plane structure is photographic (press stretch inverted by an assumed power law); absolute surface brightness is set by one emission-measure scale, not by calibrated photometry.",
  "Depth is a model: pillar depths follow the NASA/STScI positioning mesh (scaled by the measured angular size at 6992 ly); lanes sit near the pillar plane; emission follows one depth profile.",
  "Pillar opacity is the photographic darkness mapped by a declared nonlinearity; the brightness seen over absorbers is treated as gas emitting between the ship and them, with the background spectrum.",
  "Grey dust, single scattering with a Henyey-Greenstein phase function; no multiple scattering; no calibrated observer physiology."
 ],
 "statistics": {
  "wideEmissionRef": 0.7175013422966003,
  "pillarVoxels": 7243704,
  "pillarBoxLy": [
   6.390000000000001,
   10.53,
   9.81
  ],
  "maxPillarColumnLy": 2.4950000953674314,
  "nearVeilFraction": 0.024564391002058983
 },
 "sha256": {
  "eagle-wide.png": "ef84e0eff17af32cbbbafe5c208402ea41d9d98d3de81b8be5af6c3c893cd996",
  "eagle-near.png": "f603ed9f78eca571774538717eef9eb4a0117d88bb62093be3b5171dbf4db9fe",
  "eagle-pillars.png": "92b9c214aedb25fa9bc5a23a382d62d3c343f26aa6fa49fe977d317691718003",
  "pillars-mesh.bin": "ddc2eaaa48fd56289e083b68520745fbd92eb850884ee54a0b45ccc857bd980a"
 }
}