questions about superscripts and Greek characters

Dear NCL experts,

I want to generate a plot with the units (see correct.png in the
attachment). But I got the wrong one (see wrong.png in the attachment).

I saw your function code and equations pages on how to do subscripts,
superscripts, and greek characters:
http://www.ncl.ucar.edu/Applications/fcodes.shtml
http://www.ncl.ucar.edu/Applications/eqn.shtml

However, I still do not know where came the problem. Could you please help
me to see the following codes?
res@gsnRightString = "units: " + "Wm~S~-2~N~sr~S~-1~N~" + "~F8~m~NN" +
"~m~S~-1~N~"

Thanks a lot.

Best,
Yi

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