# Sparse Plane Wave Approximation of Acoustic Modes to Address Basis Mismatch
## 3 Proposed Combined Two-Stage Method
### Stage 2: Estimation of PWAs and Directions Using Parametric SBL
#### 3.2.3 Hidden Random Variable Inference
**Data Availability Statement:** The data presented in this study are available on request from the corresponding author. **Acknowledgments:** The authors would like to thank [PERSON] and [PERSON] for comments and discussion. **Conflicts of Interest:** The authors declare no conflict of interest. ## References

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