As detailed already on the pages of RealClimate, this so - called «correction» was nothing more than a botched
application of the MBH98 procedure, where the authors (MM) removed 80 % of the proxy data actually used by MBH98
during the 15th century period (failing in the
process to produce a reconstruction that passes standard «verification» procedures — an
error that is oddly similar to that noted by Benestad (2004) with regard to another recent McKitrick paper).