At the same time, it can be noted that the occurrences of specific groups are mostly staying constant throughout the whole range of wavelengths. For example, the methoxy and vinyl groups' occurrences change within a window of ± 5 % throughout the spectral range. While this may be interpreted as a hint that this substituent has less impact on the considered property, a final simplification statement should only be made after careful cross-evaluation. Finally, the hydrogen and methyl substituents show the same behaviour for increasing wavelengths. This can be understood as a hint that they serve the same purpose for the specific property under consideration. In this specific pair, both substituents are known for weak electron donating effects -which shows that a weak electron donation at the center is apparently more desirable to achieve low wavelength excitations.