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      "id": "f06_preliminary",
      "title": "Figure 6b \u00b7 Historical preliminary image comparison",
      "section": "3.3",
      "status": "historical development",
      "caption": "Historical development comparison for F1 (S24 C2K2; tess2020120182919-s0024-2-2, observed 2020-04-29). The left panel shows the archived science FFI minus its saved diff_linear/ks_b background map, which the same-run F=4 temporal-WCS bootstrap used as science input. The right panel shows that run's Hotpants hp_d signed residual after subtracting the adopted-weight, band-combined PS1 template (ko=2, bgo=0). Both panels show the identical, unbinned 256 x 256 crop at science-crop coordinates x=[1152,1408), y=[1344,1600), with matching origin and orientation. The crop was selected from Gaia scene-fit ePSF-contributor density (45 contributors; maximum on a 64-pixel scan among tiles avoiding x=[1000,1040]), not from the residual image; it lies away from the known saturation-bleed column near x=1020. Both panels use one diverging colormap and the same symmetric-log scale from -10000 to 10000 electrons s^-1: linear from -10 to +10 and logarithmic outside, with white at zero. The common symmetric limit is the next decade above the pooled 99.9th percentile of absolute intensity (minimum 100); values outside are colour-clipped. Every finite pixel is displayed regardless of mask flags; non-finite pixels are gray. This archived bootstrap is illustrative only, not the adopted five-FFI recipe and not a validation of photometric accuracy. Its README records that the adopted-weight template used a delta-form blur whose accuracy on 141 mostly seam cells was not separately quantified.",
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      "observation": "tess2020120182919-s0024-2-2",
      "science_crop": {
        "x": [
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        ],
        "y": [
          0,
          2048
        ],
        "ffi_origin": [
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          0
        ]
      },
      "pairing_verification": {
        "before_definition": "same observation FFI extension 1 crop [y=0:2048, x=44:2092] minus the recorded diff_linear/ks_b FITS image",
        "after_definition": "same-run bootstrap diff_tvwcs/hp_d FITS image; primary FFISTEM and DIFFLANE headers asserted",
        "matched_observation": true,
        "matched_crop_shape_pixels": [
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          2048
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        "displayed_before_and_after_slices_identical": true,
        "displayed_slice_xy_half_open": [
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            1408
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          [
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            1600
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        "units_asserted_electrons_s": true
      },
      "zoom_crop": {
        "x": [
          1152,
          1408
        ],
        "y": [
          1344,
          1600
        ],
        "selection": "256x256 max Gaia ePSF contributor count (45) on a 64-pixel scan, excluding x=[1000,1040] to avoid the known saturation-bleed column; selected without residual inspection"
      },
      "display": {
        "shared_before_after_transform": "symmetric log",
        "shared_before_after_limits_electrons_s": [
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          10000.0
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        "linear_interval_electrons_s": [
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          10.0
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        "log_base": 10,
        "zero_rgba": [
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          1.0,
          1.0,
          1.0
        ],
        "shared_axes": true,
        "panel_gap": 0,
        "mask_policy": "display every finite pixel; mask bits do not hide data",
        "displayed_panels": 2,
        "display_sampling": "native pixel",
        "contributor_density_used_for_crop": 45,
        "contributor_markers": 0,
        "removed_neighbor_truth_catalog": false
      },
      "recipe": {
        "background": "/astro/armin/koji/syndiff/data/s0024/c2/k2/diff_linear/ks_b/tess2020120182919-s0024-2-2_ks_b.fits.fz",
        "science": "FFI - ks_b",
        "template_sampling": 4,
        "wcs": "temporal_cheb5_bspline_v1",
        "band_weights": [
          0.254,
          0.4368,
          0.1654,
          0.1438
        ],
        "hotpants": {
          "ko": 2,
          "bgo": 0,
          "sigma_gauss": [
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            1.88,
            3.76
          ]
        }
      },
      "limitations": [
        "Historical single-FFI development product; not the adopted five-FFI recipe.",
        "Scene-fit contributor density selects the crop; markers are not drawn and are not a complete truth set of removed sources.",
        "The adopted-weight bootstrap used a delta-form blur; 141 mostly seam cells have unquantified replica error.",
        "Figure is illustrative and does not validate the preliminary subtraction photometry."
      ]
    }
  ]
}