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How to plot terrain slope within the domain?

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Hello WRF community,

I would like to check my terrain slope within domain. How I can do that? I'm aware that I should be able to calculate it from terrain height field, but have no idea how to proceed.

One reference of the result that I want, I found to be shared in "Noah land model modifications to improve snowpack prediction in the Colorado Rocky Mountains" by Barlage et al. (2010), like this:

Any ideas how to do that (GrADS, or basically anything..)?
Thank you in advance.