LST	Land Surface Temperature
LSE	Land Surface Emissivity
TES	Temperature and Emissivity Separation
TRSM	the Two Step Retrieval method
TOA	Top of Atmosphere
4A/OP	Operational release for Automatized Atmospheric Absorption Atlas
TIGR	Thermodynamic Initial Guess Retrieval
NE∆T	Noise Equivalent Temperature Difference
IASI	the Infrared Atmospheric Sounding Interferometer
CrIS	the Cross-track Infrared Sounder
SEVIRI	the Spinning Enhanced Visible and Infrared Imager
ANN	Artificial Neural Network
RMSE	the Root Mean Square Error