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  ],
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@@ -58,21 +58,35 @@
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  "field_strength_note": "B0 is a replay knob; pack is field-agnostic (id intentionally carries no field)",
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@@ -97,7 +111,8 @@
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  "g_ratio": 0.7,
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  },
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  "note": "Modest dipolar per-axon field (few Hz @3T) \u2192 SE refocuses the static part, GRE T2* grows with B0; dense, low-dispersion bundle \u2192 strong diffusion anisotropy."
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  }
 
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  "field_strength_note": "B0 is a replay knob; pack is field-agnostic (id intentionally carries no field)",
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  },
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  "note": "Modest dipolar per-axon field (few Hz @3T) \u2192 SE refocuses the static part, GRE T2* grows with B0; dense, low-dispersion bundle \u2192 strong diffusion anisotropy."
118
  }
cactus-axons/single-bundle-g070-icvf061.md CHANGED
@@ -34,15 +34,16 @@ A **replay pack** (`.rpk`) — a compressed Monte-Carlo master walk on a *synthe
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  | f_myelin | 0.2589 |
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  | f_extra | 0.3924 |
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  | Voxel box (µm) | [30.0, 30.0, 30.0] |
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- | Fibre axis | [1.0, 0.0059, -0.0043] |
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  | Boundary condition | reflecting voxel box (extra pool) |
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  ## Orientation & coordinate frame
41
 
42
  The substrate carries an **intrinsic orthonormal frame** so that field and gradient directions are defined *relative to the fibre*, reproducibly, run to run. We follow the replay invariant: we **rotate the acquisition into the substrate**, never the substrate into a lab frame — so parallel vs perpendicular B0 (very different susceptibility dephasing) and every diffusion-gradient direction mean the same thing on every replay.
43
 
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- - **Fibre axis** (`z`, in stored coordinates): `[1.0, 0.0059, -0.0043]`
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- - **Perpendicular basis** (fixed — no free rotation about the fibre): `x = [0.004, 0.0, 1.0]`, `y = [0.006, -1.0, 0.0]`
 
46
 
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  A single axis would leave a free rotation about the fibre; the full frame pins the perpendicular plane, so multi-direction and b-tensor schemes are oriented unambiguously.
48
 
@@ -67,7 +68,7 @@ Intrinsic descriptors of the substrate itself: the off-resonance field the spins
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  | extra | 0.863 | [-1.404, +1.467] |
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  | **overall** | **0.974** | |
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- **Geometry:** icvf = 0.6076 · g ratio = 0.7 · dispersion deg = 10 · S over V per m = 4.416e+06 · n fibres = 366
71
 
72
  > Modest dipolar per-axon field (few Hz @3T) → SE refocuses the static part, GRE T2* grows with B0; dense, low-dispersion bundle → strong diffusion anisotropy.
73
 
 
34
  | f_myelin | 0.2589 |
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  | f_extra | 0.3924 |
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  | Voxel box (µm) | [30.0, 30.0, 30.0] |
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+ | Fibre axis | [1.0, 0.006, -0.0044] |
38
  | Boundary condition | reflecting voxel box (extra pool) |
39
 
40
  ## Orientation & coordinate frame
41
 
42
  The substrate carries an **intrinsic orthonormal frame** so that field and gradient directions are defined *relative to the fibre*, reproducibly, run to run. We follow the replay invariant: we **rotate the acquisition into the substrate**, never the substrate into a lab frame — so parallel vs perpendicular B0 (very different susceptibility dephasing) and every diffusion-gradient direction mean the same thing on every replay.
43
 
44
+ - **Fibre axis** (`z`, in stored coordinates): `[1.0, 0.006, -0.0044]`
45
+ - **Perpendicular basis** (fixed — no free rotation about the fibre): `x = [0.004, 0.0, 1.0]`, `y = [0.006, -1.0, -0.0]`
46
+ - **Populations**: 1 (single coherent bundle; no crossing)
47
 
48
  A single axis would leave a free rotation about the fibre; the full frame pins the perpendicular plane, so multi-direction and b-tensor schemes are oriented unambiguously.
49
 
 
68
  | extra | 0.863 | [-1.404, +1.467] |
69
  | **overall** | **0.974** | |
70
 
71
+ **Geometry:** icvf = 0.6076 · g ratio = 0.7 · dispersion deg = 10 · S over V per m = 4.416e+06 · n fibres = 366 · n populations = 1
72
 
73
  > Modest dipolar per-axon field (few Hz @3T) → SE refocuses the static part, GRE T2* grows with B0; dense, low-dispersion bundle → strong diffusion anisotropy.
74
 
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  "note": "Modest dipolar per-axon field (few Hz @3T) \u2192 SE refocuses the static part, GRE T2* grows with B0; dense, low-dispersion bundle \u2192 strong diffusion anisotropy."
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