Wavelength min. [nm or cm^{-1}]
Wavelength max. [nm or cm^{-1}]
Wavelength res. [nm or cm^{-1}]
Values < 2000 are interpreted as [nm]. Stay within consistent unit system for these three parameters.
Resulting total number of data points must be ≤ 1001.
Needed for simulating pressure broadening and shifting.