Discussion
What does the appearance of a broad hump under the aromatic region usually indicate?
Answer: D
Broad underlying humps come from species that tumble slowly, such as polymers, aggregates or particulate matter, whose short T2 gives very wide lines. Filtering the sample or diluting it often removes them. A phase error deforms individual peaks rather than adding a featureless hump, truncation gives sinc wiggles beside sharp peaks, and excess TMS gives a large sharp line at zero. Distinguishing a broad genuine signal from a baseline fault is a matter of seeing whether it survives a change of processing.
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