Data:   GISS file GLB.Ts+dSST.txt
HadCRUT4  file monthly and annual
RSS file RSS_Monthly_MSU_AMSU_Channel_TLT_Anomalies_Land_and_Ocean_v04.0.txt
UAH file tltglhmam_6.0
Blue curve is the mean of GISS and HadCRUT4 (for the last year, one time series (typically GISS) is used if the other time series (typically HadCRUT4) is not available yet); red curve is the mean of RSS and UAH.