( ( The ( frame size ) ) ( ( was ( defined ( according ( to ( ( the distance ) ( between ( ( two ripples ) ( as ( illustrated ( in Fig ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN frame) (NN size)) (VP (VBD was) (VP (VBN defined) (PP (VBG according) (PP (TO to) (NP (NP (DT the) (NN distance)) (PP (IN between) (NP (NP (CD two) (NNS ripples)) (PP (IN as) (NP (NP (JJ illustrated)) (PP (IN in) (NP (NNP Fig)))))))))))) (. .)))
The frame size was defined according to the distance between two ripples as illustrated in Fig.
(ROOT (S (NP (NNP Distance)) (VP (VBZ is) (VP (VBN defined) (PP (IN as) (NP (NP (DT the) (NN magnitude) (CC or) (NN size)) (PP (IN of) (NP (NP (NN displacement)) (PP (IN between) (NP (CD two) (NNS positions))))))))) (. .)))