{
  "$comment": "Normative physical geometry of oTAPE 1.0 (spec §12, Appendix B). Millimetres; origin at the top-left of each object, x to the right, y down, cassette upright with the head opening at the bottom. Machine-readable twin of the tables in oTAPE-1.0.md.",
  "format_version": "1.0",
  "units": "mm",
  "resolution": {
    "recommended_px_per_mm": 24,
    "minimum_px_per_mm": 12,
    "aspect_tolerance": 0.01
  },
  "shell": {
    "width": 100.4,
    "height": 63.8,
    "thickness": 12.0,
    "corner_radius": 3.5,
    "head_opening": [[17.0, 63.8], [23.6, 49.5], [76.8, 49.5], [83.4, 63.8]],
    "screw_diameter": 2.4,
    "screws": [[3.0, 3.0], [97.4, 3.0], [3.0, 60.8], [97.4, 60.8], [50.2, 52.6]],
    "head_holes": [
      { "center": [30.1, 57.4], "diameter": 3.6 },
      { "center": [39.2, 57.4], "diameter": 2.4 },
      { "center": [61.2, 57.4], "diameter": 2.4 },
      { "center": [70.3, 57.4], "diameter": 3.6 }
    ],
    "head_slot": { "x": 45.2, "y": 55.8, "width": 10.0, "height": 4.5 }
  },
  "mechanism": {
    "window": { "x": 30.2, "y": 21.5, "width": 40.0, "height": 12.0, "corner_radius": 1.5 },
    "left_hub": [29.0, 27.5],
    "right_hub": [71.4, 27.5],
    "hub_hole_diameter": 17.0,
    "drive_hub_diameter": 12.0,
    "reel_core_radius": 11.0
  },
  "label": {
    "width": 89.0,
    "height": 42.0,
    "corner_radius": 2.0,
    "origin_on_shell": [5.7, 3.5],
    "safe_inset": 2.0,
    "keep_out_margin": 0.5,
    "zones": {
      "side_letter_box": { "x": 2.5, "y": 3.0, "width": 6.5, "height": 8.0 },
      "title_line": { "x": 11.0, "y": 3.5, "width": 75.5, "height": 7.0, "baseline": 9.5 },
      "side_title_line": { "x": 11.0, "y": 10.5, "width": 75.5, "height": 4.5, "baseline": 14.0 },
      "bottom_band": { "x": 0.0, "y": 33.0, "width": 89.0, "height": 9.0 },
      "type_badge": { "x": 70.0, "y": 35.0, "width": 16.5, "height": 5.0 }
    },
    "ruled_lines_y": [10.5, 15.5, 31.5]
  },
  "jcard": {
    "height": 101.6,
    "front_width": 63.5,
    "spine_width": 12.7,
    "flap_width": 15.9,
    "unfolded_order": ["flap", "spine", "front"],
    "safe_inset": 3.0,
    "spine_safe_inset": 1.5,
    "booklet_panel_width": 63.5
  },
  "case": { "width": 109.0, "height": 70.0, "depth": 17.0 },
  "artwork_slots": {
    "cassette_face_a": { "width": 100.4, "height": 63.8, "path": "artwork/cassette-face-a.png", "alpha": "required" },
    "cassette_face_b": { "width": 100.4, "height": 63.8, "path": "artwork/cassette-face-b.png", "alpha": "required" },
    "label_a": { "width": 89.0, "height": 42.0, "path": "artwork/label-a.png", "alpha": "keep-out" },
    "label_b": { "width": 89.0, "height": 42.0, "path": "artwork/label-b.png", "alpha": "keep-out" },
    "jcard_front": { "width": 63.5, "height": 101.6, "path": "artwork/jcard-front.jpg", "alpha": "none" },
    "jcard_spine": { "width": 12.7, "height": 101.6, "path": "artwork/jcard-spine.png", "alpha": "none" },
    "jcard_flap": { "width": 15.9, "height": 101.6, "path": "artwork/jcard-flap.png", "alpha": "none" },
    "booklet_panel": { "width": 63.5, "height": 101.6, "path": "artwork/booklet-NN.png", "alpha": "none" },
    "thumbnail": { "square": true, "recommended_px": 1024, "minimum_px": 256, "path": "artwork/thumbnail.png", "alpha": "allowed" }
  },
  "reels": {
    "tape_speed_cm_per_s": 4.76,
    "hub_radius_cm": 1.1,
    "tape_thickness_cm": [
      { "max_side_seconds": 2100, "thickness": 0.0018 },
      { "max_side_seconds": 3000, "thickness": 0.0012 },
      { "max_side_seconds": null, "thickness": 0.0009 }
    ]
  },
  "cassette_types": {
    "C46": 1380,
    "C60": 1800,
    "C90": 2700,
    "C120": 3600,
    "custom": { "min": 1, "max": 5400 }
  }
}