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这是我画副高脊线的gs文件,但是画出了很多脊线,我只想要副高脊线,怎么修改呢?
 - 'reinit'
- iyear=1958
- 'sdfopen **\hgt.'iyear'.nc'
- 'sdfopen **\uwnd.'iyear'.nc'
- 'set grads off'
- 'set grid off'
- 'set map 1 1 8'
- 'set mpdset hires'
- 'set mpdset cnworld'
- 'set vpage 0 11 0 8.5'
- 'set parea 1.0 10 1 8'
- 'set lat 0 90'
- 'set lon 40 180'
- 'set lev 500'
- 'set t 1'
- k=152
- while(k<=273)
- 'set t ' k
- 'set xlopts 1 1 0.16'
- 'set ylopts 1 1 0.16'
- *'set xlint 5'
- *'set ylint 5'
- 'set grads off'
- 'set grid off'
- 'set cint 2'
- 'set gxout contour'
- 'set cthick 5'
- 'set cterp on'
- 'set csmooth on'
- *'set clevs 0'
- *'set clab off'
- 'd hgt/10.0'
- 'set gxout contour'
- 'set clevs 0'
- 'define ms=cdiff(uwnd.2,y)'
- 'set cthick 8'
- 'set ccolor 2'
- 'd maskout(uwnd.2,ms)'
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