From	Phil Jones	Date	Mon Aug 7 13:58:54 2000
To	Tom Crowley, Michael E. Mann
Subject	Re: mill records
Tom and Mike, What Tom said is essentially correct. Tim Osborn here recalibrated each series, as a composite, against the same NH series for the April- Sept average north of 20N (using land only data). All this does is rescale the series as it is simple regression (y=ax+b). Because y is based on temps wrt 61-90 this means that the axis is then wrt 61-90. Doing this we can then add the same instrumental temp series. It also brings the series together and the web page was just for illustrative purposes. For Mike's series you get pretty much the same result by subtracting 0.12 from Mike's numbers as this is the difference between Mike's base period and 1961-90. There is nothing sinister going on ! I'll summarise this to Rob. Cheers Phil PS I seem to be stirring up loads of emails about historical data. You are both on those emails so you can see what crap is being written and my (time wasting for me) replies. Apologies for replying. I should know better and keep quiet. We can all expect more of this if IPCC stays in roughly the same form pre-Victoria. It's relatively easy to knock historical records, so as long as it gets no worse than this we'll be fine.