Fig. 4
From: Blackbody radiation shift assessment for a lutetium ion clock
BBR shift on the 1S0 ↔ 3D1 transition. The shaded region is the total uncertainty from both the measurement, Δα0,1 (νm), and extrapolation, Δα0,1 (0). The blue and red lines give the total uncertainty boundaries when Δα0,1 (0) is fixed at 0.012 (a.u.) and 0.024 (a.u.), respectively. Dashed line indicates the temperature at which δνbbr depends only on Δα0,1 (νm). Solid lines indicate the operating condition of 300 ± 5 K and corresponding fractional frequency uncertainty of 2 × 10−19
