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How to read in external arrays in WPS/WRF?

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New member
Hello, everyone!
I am working on calibrating some radiation-related variables in WRF. I need to read in several external arrays (.grd) in WRF and I have[*] interpolated these arrays onto the model grid dimension accroding to the setteings of the namelist.wps.
How to read in them and write them into the
Thank you for your help!