<Tr> <Td> Near - Infrared </Td> <Td> NIR </Td> <Td> (0.7--1) to 5 μm </Td> </Tr> <Tr> <Td> Mid-Infrared </Td> <Td> MIR </Td> <Td> 5 to (25--40) μm </Td> </Tr> <Tr> <Td> Far - Infrared </Td> <Td> FIR </Td> <Td> (25--40) to (200--350) μm . </Td> </Tr> <P> These divisions are not precise and can vary depending on the publication . The three regions are used for observation of different temperature ranges, and hence different environments in space . </P>

The wavelengths of thermal infrared energy emitted by the earth are