1 INTRODUCTION

2 OBSERVATIONS  
2.1 Data reduction

3 RESULTS

4 DISCUSSION  
4.1 Class I $\mathbf{CH}_{3}\mathbf{OH}$ masers on a HMSF evolutionary timeline  
4.2 Properties of detected class I $\mathbf{CH}_{3}\mathbf{OH}$ masers  
4.3 Comparing class I $\mathbf{CH}_{3}\mathbf{OH}$ masers with other masers and thermal lines  
4.4 Comparing class I $\mathbf{CH}_{3}\mathbf{OH}$ masers with $\mathbf{870}\,\mu\mathbf{m}$ dust continuum from ATLASGAL  
4.5 Comparing class I $\mathbf{CH}_{3}\mathbf{OH}$ masers in cross- and auto-correlation

5 SUMMARY AND CONCLUSIONS