Image:Soi-1876-2004.png
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SOI index, 1876-2004. By William M. Connolley.
Red: monthly averages Blue: 12 month running mean
Data from ftp://ftp.bom.gov.au/anon/home/ncc/www/sco/soi/soiplaintext.html.
IDL script:
a=readfromfile('soi.txt')
a1=a(1:12,*)
y=a(0,*)
a2=avg(a1,0)
n=n_elements(y)
a3=smooth(reform(a1,n*12),13)
y1=a1
for i=0,n-1 do y1(i*12+indgen(12))=y(i)+indgen(12)/12.
device,set_res=500*[1.5,1]
plot,/xs,y1,a1,yr=25*[-1,1],/nodata
oplot,y1,a1,col=2
oplot,y1,a3,th=3,col=3
oplot,makerange(y1),[0,0]
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