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Annual Average reference evapotranspiration.

I am new to InVEST and trying to run Water yield model in Basin of Nepal. For average annual reference evapotranspiration by modified Hargreaves equation, how to compute extra terrestial radiation(RA) value? I tried to read few literature but could not be clear about it. I would me much thankful for your consideration to guide me. 
-Shikshya

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