value unc_up unc_lo author ref method 17.54 1.300 1.300 Tedesco 2002AJ....123.1056T STM 19.58 2.215 2.215 Ryan&Woodward 2010AJ....140..933R IRAS-STM 21.53 1.139 1.139 Ryan&Woodward 2010AJ....140..933R IRAS-NEATM