All the exposures below were for 8s; the standard arc exposure is 2s.Silly me, only one lamp out of four was plugged in...

All the following plots have the same vertical scale, and show every 40th spectrum on the image.
The single red, yellow, blue, and green traces are spurious.

8400 to 9200 Angstroms

This range shows the red end of the detector; there should be usefully bright Ar lines at 8424 and 9123 A.

Existing, operational, Ne-only lamps: 8400 to 9200 Angstroms:


"50% Ne, 50% Ar" lamps: 8400 to 9200 Angstroms:


"10% Ne, 90% Ar" lamps: 8400 to 9200 Angstroms:


7450 to 8200 Angstroms

This range shows the brightest arc lines in the full 90% Ar / 10% Ne image, and is just redward of a bright Ne line. The strongest Ar lines should be at 7635 and 8115 Angstroms

Existing, operational, Ne-only lamps: 7450 to 8200 Angstroms:


"50% Ne, 50% Ar" lamps: 7450 to 8200 Angstroms:


"10% Ne, 90% Ar" lamps: 7450 to 8200 Angstroms: