From the CRU code file osborn-tree6/briffa_sep98_d.pro , used to prepare a graph purported to be of Northern Hemisphere temperatures and reconstructions.
; ; Apply a VERY ARTIFICAL correction for decline!! ; yrloc=[1400,findgen(19)*5.+1904] valadj=[0.,0.,0.,0.,0.,-0.1,-0.25,-0.3,0.,- 0.1,0.3,0.8,1.2,1.7,2.5,2.6,2.6,$ 2.6,2.6,2.6]*0.75 ; fudge factor if n_elements(yrloc) ne n_elements(valadj) then message,’Oooops!’ ; yearlyadj=interpol(valadj,yrloc,timey)
As Eric notes, this is purely manipulation of data to get the desired result. This isn't science. This is propaganda.
Edit: The Geek has some additional thoughts.