求帮助，自己模仿文献出了几张图，可就是不对，求指正

dyhtt29

下面是gs文件
'open E:\data\ozone5x10-v8.ctl'
'set grads off'
'set grid off'
'set csmooth on'
'set xlopts 1 6 0.14'
'set ylopts 1 6 0.14'
'set lat -67.5 67.5'
'set ylint 22.5'
'set t 1 12'
'set lev 0'
'set gxout contour'
'define oz=ave(oz,lon=0,lon=360,-b)'
'set lon 0'
'set xyrev on'
'd oz'


'open E:\data\ozone5x10-v81.ctl'
'set grads off'
'set grid off'
'set csmooth on'
'set xlopts 1 6 0.14'
'set ylopts 1 6 0.14'
'set lat -67.5 67.5'
'set ylint 22.5'
'set t 1 12'
'set lev 0'
'set gxout contour'
'set lon 0'
'set xyrev on'
'define oz=ave(oz,lon=75,lon=105,-b)'
'd oz'

'open E:\data\ozone5x10-v82.ctl'
'set grads off'
'set grid off'
'set csmooth on'
'set xlopts 1 6 0.14'
'set ylopts 1 6 0.14'
'set lat -67.5 67.5'
'set ylint 22.5'
'set t 1 12'
'set lev 0'
'set gxout contour'
'set lon 0'
'set xyrev on'
'd ave(oz,lon=75,lon=105,-b)-ave(oz,lon=0,lon=360,-b)'

dyhtt29

{:eb302:}{:eb302:}