Assertion: nebula's hydrogen | /r/HasProperty | 2.12 micrometres
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text: Also, the image contains 45 minutes of archival infra-red observations performed with the same telescope and the infrared camera Omega 2000, centred on the emission line of molecular hydrogen (2.12 micrometres), that helps to better define the wavefronts in the external, faint halo of the nebula.