Keep in mind that charts like that deal with the instrument's fundamental frequencies.
That is a valid view for the "sustain part" BUT if one has changes in level too, then the bandwidths are usually wider in both directions.
For example play a distortion free sine wave at frequency X, examine it's spectrum and it's just one frequency X.
Take that same signal and make it's amplitude ramp up and down and follow a gausian curve (the most gentile shape) from 0 to full to zero amplitude. If you do that within 5 or 6 cycles, you have a "burp" signal that now has about a 1/3 octave wide bandwidth and the shorter the envelope, the wider the bandwidth is require to reproduce that signal.
The up shot, for example if you play bass guitar and can play through something that really goes down low and loud enough to hear, you find your plucking or picking (especially with a bass like an EB-3 or PB) produces very low components that normal bass rigs can't produce.
Best,
Tom