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We present the test results of science grade 4 K × 4 K HgCdTe H4RG‐15 and H4RG‐10 SWIR 2.5 μm sensor chip assemblies (SCAs). Teledyne's 4 K × 4 K, 15 and 10 μm pixel pitch infrared arrays are developed for space and era of Extremely Large Telescopes. They are currently being used in new instrumentation on existing telescopes and missions. We report data on H4RG‐15 and H4RG‐10 arrays that have achieved...