1. High Temperature Metrology Department, Laboratoire Commun de Métrologie, LNE-Cnam, 61 rue du Landy, St Denis 93210, France
2. Engineering Measurement Division, National Physical Laboratory (NPL), Hampton Road, Teddington TW11 0LW, UK
3. Physikalisch-Technische Bundesanstalt (PTB), Abbestrasse 2-12, Berlin 10587, Germany
4. Centro Español de Metrologia (CEM), C/del Alfar, 2, Tres Cantos 28760, Spain
5. Tubitak Ulusal Metroloji Enstitüsü (TUBITAK UME), Gebze/Kocaeli 41400, Turkey
6. Thermal and Mass Metrology, VTT Technical Research Centre of Finland Ltd, Centre for Metrology MIKES, Espoo 02150, Finland
7. Radiometry and Photometry Division, National Institute of Standards (NIS), President Sadat Street, El-Haram, PO Box 136, Giza, Egypt