1. Introduction

2. The data sample  
2.1. Distances, BH masses and velocity dispersions  
2.2. Bulge masses, sizes and densities  
2.3. Errors on \( r_{h}, \rho_{h} \) and \( M_{Bu} \)  
2.4. External comparisons  

3. The error matrix

4. Exploring multivariate correlations

5. BH Correlation analysis

6. Discussion  
6.2. A simple interpretation framework  

7. Conclusions