: a diffraction grating made by ruling a plane metallic mirror with lines having a relatively wide spacing
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The echelle spectrograph for rocky exoplanets and stable spectroscopic observations (ESPRESSO) is an excellent tool to make these observations.
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Chris Lee, Ars Technica, 28 Apr. 2020
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Chris Lee, Ars Technica, 28 Apr. 2020
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“Echelle.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/echelle. Accessed 30 Oct. 2025.
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