1.  Introduction

2.  Observations

3.  Spatial comparison to models

   3.1  DEM L323:  O3-4
     3.1.1  U-sensitive diagnostics
     3.1.2  T_*-sensitive diagnostics
     3.1.3  Comparison to Hummer & Mihalas atmospheres

   3.2  DEM L243:  O7
     3.2.1  Photoionization models
     3.2.2  The SNR
   
   3.3  DEM L199:  Early WR
     3.3.1  WR model atmospheres
     3.3.2  Photoionization models

   3.4  DEM L301:  O3 shell

4.  Spatially integrated spectra:  T_* sequence

5.  Conclusion