( ( ( An interval ) ( in ( the ( electromagnetic spectrum ) ) ) ) ( ( defined ( by ( ( ( ( ( ( two wavelengths ) , ) frequencies ) , ) or ) ( wave numbers ) ) ) ) . ) )
(ROOT (S (NP (NP (DT An) (NN interval)) (PP (IN in) (NP (DT the) (JJ electromagnetic) (NN spectrum)))) (VP (VBN defined) (PP (IN by) (NP (NP (CD two) (NNS wavelengths)) (, ,) (NP (NNS frequencies)) (, ,) (CC or) (NP (NN wave) (NNS numbers))))) (. .)))
An interval in the electromagnetic spectrum defined by two wavelengths, frequencies, or wave numbers.
(ROOT (S (NP (DT The) (JJ electromagnetic) (NN spectrum)) (VP (VBZ represents) (NP (NP (DT the) (JJ full) (NN range)) (PP (IN of) (NP (NP (NN frequency)) (PP (IN of) (NP (JJ electromagnetic) (NNS waves))))))) (. .)))