Conventions and Explanations:

F - measurement frequency 
k - normalized attenuation coefficient (NAC)
n - refractive index (RI)
r - bulk density of soil sample
t - measurement temperature
W - volumetric moisture of soil sample

1. Jamal50 - soil selected on the Yamal Peninsula at the coordinates N70 25', E68 25', organic matter content is 50%
2. Jamal61 - soil selected on the Yamal Peninsula at the coordinates N66 48', E69 42', organic matter content is 61%
3. Jamal35 - soil selected on the Yamal Peninsula at the coordinates N57 06', E66 12', organic matter content is 35%
4. Alaska80 - soil selected on the North Slope of Alaska at the coordinates N68 38', W149 35', organic matter content is 80%
5. Alaska90 - soil selected on the North Slope of Alaska at the coordinates N68 38', W149 35', organic matter content is 90%
6. Taimyr38 - soil selected on the Taimyr Peninsula at the coordinates N69 21', E88 17', organic matter content is 38%