spline lambda_0 lambda_1 lambda_step
spline 290. 365. 0.5
Spline interpolate the calculated spectrum between wavelengths lambda_0
and lambda_1 in steps of lambda_step,
in nm. Specified as e.g.
Here, the calculated spectrum is interpolated to wavelengths 290.0, 290.5, 291.0,
…, 364.5, 365.0. For interpolation to arbitrary wavelengths use spline_file.
The specified wavelength interval must be within the one specified by wavelength.