Table 1

Left: Wavelengths and indicative formation heights of the K I, Na D1, Ca I, and He I 1083 chromospheric lines. Right: snapshot of the scaled-down SAMM prototype telescope at various stages of its design and development.

Line Wavelength (nm) Height (km) Diffraction limit resolution (km)
K I 770 3–400 0.71
Na D1 590 6–700 0.54
Ca I 422 1000 0.39
He I 1083 1900 1.19

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