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<div>Dear NCL Community,<span></span></div><div><br></div><div>May I know how to add a solid gray horizontal line (representing urban area) at bottom of vertial cross section plot as attached figure? Thanks.</div><div><br></div><div>What I have found as one similar example is only as follows without bottom gray line:</div><div>https://www.ncl.ucar.edu/Applications/Images/wrf_interp_3_lg.png</div>
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