Analyze this Guinier plot (ln(I) vs q²). Focus on parameters best determined from this representation:

1. **Radius of Gyration (Rg)**:
   - Identify the linear Guinier region (typically q·Rg < 1.3)
   - Calculate the slope of the linear region: slope = -Rg²/3
   - Compute Rg = √(-3 × slope)
   - Specify the q-range used for analysis

2. **Guinier Analysis**:
   - Determine the intercept (ln(I₀)) and calculate I₀
   - Assess linearity quality (R² value if possible)
   - Identify deviations from linearity at higher q²
   - Note any upward curvature suggesting aggregation

3. **Forward Scattering**:
   - Estimate I(0) from the intercept
   - Note any systematic deviations at very low q²

4. **Sample Quality Indicators**:
   - Evaluate data quality in Guinier region
   - Identify signs of interparticle interference
   - Note evidence of sample polydispersity

Report Rg with uncertainty (e.g., Rg = 4.52 ± 0.15 nm) and specify the q-range used for analysis. Include the calculated slope and intercept values.
