( ( ( The section ) ( that ( covers ( radio waves ) ) ) ) ( ( is ( marked ( Radio Frequencies ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN section)) (SBAR (WHNP (WDT that)) (S (VP (VBZ covers) (NP (NN radio) (NNS waves)))))) (VP (VBZ is) (VP (VBN marked) (NP (NNP Radio) (NNP Frequencies)))) (. .)))
The section that covers radio waves is marked Radio Frequencies .
(ROOT (S (NP (NNP Am) (NN radio) (NNS waves)) (VP (VBP exist) (PRT (RP in)) (NP (DT the) (ADJP (QP (CD 540) (TO to) (CD 1600))) (NN khz) (NN frequency) (NN range))) (. .)))