13C NMR Carbons without H's Short

In producing the 13C NMR spectra, it would be ideal if the peaks for the carbons without hydrogens (e.g. quaternary carbons, ketone carbonyls, etc.) would be 20–25% as tall as a normal peak. Chemdraw already produces taller peaks if there is more than one. For presentation for students, I use white boxes to make the spectra more realistic for my students.