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If you have a non-standard projection time horizon (i.e. not beginning in the first year of simulation, and not based purely on a trend from history) then adjust

local varHis[upperdims,timeseq]
local varBckGnd[upperdims,timeseq]
local varResult[upperdims,timeseq]

so that timeseq of varHis spans the time from which you might want to build the trend, and timeseq of varBckGnd and varResult spans the projection time.