1 INTRODUCTION

2 METHODS  
2.1 Pseudo $C_{\ell}$ formalism  
2.2 Survey model  
2.3 Fisher matrix analysis  

3 RESULTS  
3.1 Residual power spectra  
3.2 Bias in cosmological parameters  
3.3 Dependence of parameter bias on $m$-bias rms  

4 DISCUSSION  
4.1 Residual power spectra  
4.2 Bias in cosmological parameters  
4.3 Dependence of parameter bias on $m$-bias rms  

5 SUMMARY