This PR adds a warning to users that they're using pixels that do not have a wavelength solution. This also adds an extrapolation to the NaN wavelengths for Figure 3101 just for plotting purposes. I found that a cubic spline was able to perfectly predict the wavelength solution of two wavelengths artificially set to NaN for MIRI data.
Resolves #457
This PR adds a warning to users that they're using pixels that do not have a wavelength solution. This also adds an extrapolation to the NaN wavelengths for Figure 3101 just for plotting purposes. I found that a cubic spline was able to perfectly predict the wavelength solution of two wavelengths artificially set to NaN for MIRI data.