大佬们，双y轴怎么添加图例和相关系数标签呢？跪求大佬

推开世界的门

如图所示，想在图上加上图例和相关系数值
begin
x=ispan(1,10,1)
y1=(/1.0,2.0,3.0,4.0,5.0,7.0,9.0,14.0,26.0,29.0/)
y2=(/2.3,2.5,4.1,4.6,6.2,6.7,14.4,15.0,16.0,17.8/)
wks=gsn_open_wks("png","B46")
res1=True
res1@xyLineColors="red"
res1@vpHeightF=0.3
res1@vpWidthF=0.6
res1@trYMinF               = 0
res1@trYMaxF               = 30
res1@xyLineThicknesses=2
res1@xyMarkLineModes         = "MarkLines"   

res2=True
res2@xyLineColors="blue"
res2@vpHeightF=0.3
res2@vpWidthF=0.6
res2@xyLineThicknesses=2



plot2=gsn_csm_xy2(wks,x,y1,y2,res1,res2)

end

求大佬指点，接下来相加上图例和添加r=0.89这个标签怎么办

LeslieTse

估计用gsn_create_legend和gsn_add_annotation可以，参考http://www.ncl.ucar.edu/Applications/Scripts/xy_19.ncl