( ( ( ( Most astrophysical ) sources ) ( of ( radio waves ) ) ) ( ( emit ( over ( ( a ( broad range ) ) ( of frequencies ) ) ) ) . ) )
(ROOT (S (NP (NP (ADJP (RBS Most) (JJ astrophysical)) (NNS sources)) (PP (IN of) (NP (NN radio) (NNS waves)))) (VP (VBP emit) (PP (IN over) (NP (NP (DT a) (JJ broad) (NN range)) (PP (IN of) (NP (NNS frequencies)))))) (. .)))
Most astrophysical sources of radio waves emit over a broad range of 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))) (. .)))