Fig. 2From: Comparison of different machine learning approaches for tropospheric profiling based on COSMIC-2 dataDistribution of RO profiles employed in training (a) and testing (b) of machine learning models. Red triangles in (b) emphasizes radiosonde stations co-located with RO profiles. Background color shows terrain elevation. Note, the location and number of available RO soundings is restricted by the topographyBack to article page