vertical coordinate for z-wind component

Hi,
I get different vertical coordinate when I use WRF_2d_2.ncl at http://www.ncl.ucar.edu/Applications/wrf2d.shtml to present z-wind component from WRF3.4 simulation. How can I update this ncl script to get the same vertical coordinate as shown at http://www.ncl.ucar.edu/Applications/Images/WRF_2d_2_lg.png . Please also see attached plot (upper: my result by running WRF_2d_2.ncl. Bottom: from website that is what I want). I appreciate for any helpful suggestion from NCL users. Thanks.
Feng

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