AR(1) fit to the 70 series in the "tree ring" data
using the R code and McIntyre and McKitrick supply at
ftp://ftp.agu.org/apend/gl/2004GL021750/

beta = autocorrelation coefficient
sigma = standard deviation of random error

Summaries: 
average beta = 0.415
average sigma = 0.276

beta range = 0.027 0.791
sigma range = 0.041 0.556

correlation(beta, sigma) = -0.56

Series		beta	sigma
ar049.txt  0.22172840 0.39872495
ar050.txt  0.29111322 0.41833321
ar052.txt  0.53118641 0.43565749
ar053.txt  0.18959056 0.34692226
az082.txt  0.49393023 0.25688575
az086.txt  0.19898170 0.55571867
az510.txt  0.71024397 0.13057123
az550.txt  0.29414972 0.21983993
ca065.txt  0.62888177 0.21679955
ca073.txt  0.30226605 0.22082061
ca084.txt  0.37497582 0.15415441
ca087.txt  0.42995987 0.17420583
ca528.txt  0.53400096 0.16112123
ca529.txt  0.42680402 0.23044148
ca530.txt  0.79111163 0.19648140
ca531.txt  0.41160846 0.20032311
ca532.txt  0.28641420 0.20084825
ca533.txt  0.59660838 0.22940357
ca534.txt  076820021 0.21314574
ca535.txt  0.25026753 0.26839424
ca555.txt  0.60956917 0.13011027
co067.txt  0.22685078 0.28204518
co076.txt  0.26313275 0.40372102
co509.txt  0.40194243 0.28002622
co509x.txt 0.21467620 0.06869721
co511.txt  0.39788338 0.13690690
co522.txt  0.63136401 0.14747194
co523.txt  0.70031291 0.14660067
co524.txt  0.77626908 0.15575000
co525.txt  0.67592245 0.16413333
co535.txt  0.52886899 0.18672750
co545.txt  0.76237552 0.13691276
co547.txt  0.69322261 0.14382580
ga002.txt  0.16430714 0.42876417
ga003.txt  0.19647303 0.47976412
ga004.txt  0.08728344 0.34650711
la001.txt  0.38636871 0.33934570
mt006.txt  0.49491882 0.34006789
nc008.txt  0.02679753 0.48352354
nm025.txt  0.43571636 0.52212570
nm026.txt  0.35416078 0.41481476
nm559.txt  0.37166257 0.41045348
nm560.txt  0.07490781 0.42392608
nm572.txt  0.25840941 0.41212636
nv037.txt  0.47591552 0.20584549
nv049.txt  0.39039460 0.29776990
nv053.txt  0.17890242 0.37883812
nv056.txt  0.40206572 0.24040245
nv060.txt  0.25822975 0.25710329
nv061.txt  0.15446203 0.23516178
nv510.txt  0.51990789 0.21385071
nv511.txt  0.65276412 0.19930568
nv512.txt  0.56588102 0.21068773