1 Results from additional measurements carried out within the BIPM.L-K11 ongoing key comparison. L. Robertsson, M. Zucco, R. Felder L.-S. Ma BIPM, Pavillon de Breteuil, 92312 Sèvres, France Jin QUIN, Xiuying LIU, Zhongyou LIU NIM, 18, Bei san huan donglu, Bejing, Kina, Hajime Inaba, Jun Ishikawa AIST/NMIJ, 3-1 Tsukuba-central, 1-1-1 Umezono, Tsukuba, Ibaraki, Japan 305-8563 R. Hamid , UME, P.K. 54, 41470 Gebze-Kocaeli, Turkey Abstract Lasers from three national metrological institutes (NMIs) have been measured following the protocol of the BIPM.L-K11 ongoing key comparison initiated by the Comité Consultative des Longueurs (CCL) 11 th meeting in 2003. The absolute frequency of the f component of the R(127) 11-5 transition at 633 nm was measured for two of these lasers in their home institutes, AIST/NMIJ and UME, while the b 5 component of the R(106) 28-0 transition at 543 nm was measured on a standard from NIM at the BIPM. The results of these measurements are compiled in the present paper. The comparison reports, as communicated by each participant, are included as Appendices.