7.Why are the same proxies used in so many papers? Most recently, Osborn and Briffa
(2006), DÕArrigo et al. (2006), Juckes et al. (2007). Mann
et al. (1998, 1999) was ground breaking in using hundreds
of proxies. Most more recent papers focus on the top 15
or so in our two-mode network. Are they chosen because
they show the Òhockey stickÓ and those omitted donÕt?