MCBB MSBB Cavity Baffled, retro-cone base Baffled, V groved base Cavity Surface MM enhanced optical black Aeroglaze Z306 diffuse black Temperature Range (K) T1 230-350K, T2 440-520K 80K Base Temp Spatial T1 <= ±50mK, T2 <= ±100mK <= ±100mK Uniformity (K) Base Temperature T1 <= ±30mK, T2 <= ±30mK <=±100mK Gradients (K) Baffle and Aperture T1 <= ±2K, T2 <= ±5K <=±5K Temp Grad (K) Estimated Emissivity T1 >= 0.999, T2 >= 0.97 >=0.99