# Technical Document Analysis: Line Chart
## Title
**Low-d case: p = 100, q = 3, s = 5**
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## Axis Labels
- **X-axis**: `n` (values: 256, 512, 1024, 2048, 4096)
- **Y-axis**: `L₁ estimation error` (range: 0.5 to 9.0)
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## Legend
- **Location**: Top-right corner
- **Labels**:
- Green Square
- Purple Triangle
- Gray Cross
- Red Circle
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## Data Series & Trends
### 1. Green Square Line
- **Trend**: Steeply decreasing from ~9.5 (n=256) to ~2.5 (n=4096)
- **Data Points**:
- n=256: ~9.5
- n=512: ~8.0
- n=1024: ~7.5
- n=2048: ~6.5
- n=4096: ~2.5
### 2. Purple Triangle Line
- **Trend**: Gradual decrease from ~9.0 (n=256) to ~2.2 (n=4096)
- **Data Points**:
- n=256: ~9.0
- n=512: ~8.0
- n=1024: ~7.0
- n=2048: ~6.0
- n=4096: ~2.2
### 3. Gray Cross Line
- **Trend**: Moderate decrease from ~7.0 (n=256) to ~1.0 (n=4096)
- **Data Points**:
- n=256: ~7.0
- n=512: ~6.0
- n=1024: ~5.0
- n=2048: ~4.0
- n=4096: ~1.0
### 4. Red Circle Line
- **Trend**: Gentle decrease from ~2.5 (n=256) to ~1.2 (n=4096)
- **Data Points**:
- n=256: ~2.5
- n=512: ~1.8
- n=1024: ~1.5
- n=2048: ~1.3
- n=4096: ~1.2
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## Spatial Grounding
- **Legend Position**: Top-right corner (confirmed via visual alignment)
- **Color Consistency**:
- Green squares match the highest line (Green Square).
- Purple triangles align with the second-highest line (Purple Triangle).
- Gray crosses correspond to the third line (Gray Cross).
- Red circles match the lowest line (Red Circle).
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## Key Observations
1. All lines exhibit a **monotonic decreasing trend** as `n` increases.
2. The **Green Square** and **Purple Triangle** lines show the steepest declines, suggesting faster convergence.
3. The **Red Circle** line has the slowest rate of decrease, indicating lower sensitivity to `n`.
4. At `n=4096`, all lines converge toward lower error values, with the Red Circle line reaching the lowest error (~1.2).
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## Notes
- No additional text or embedded diagrams are present.
- All data points are visually interpolated from the chart; exact numerical values are approximated.
- No non-English text detected.
