Generally, FGD systems tend to be constructed closer to the ground compared to SCR technology retrofits.
( Generally ( , ( ( FGD systems ) ( ( tend ( to ( be ( ( constructed ( closer ( to ( the ground ) ) ) ) ( compared ( to ( SCR ( technology retrofits ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (ADVP (RB Generally)) (, ,) (NP (NNP FGD) (NNS systems)) (VP (VBP tend) (S (VP (TO to) (VP (VB be) (VP (VBN constructed) (ADVP (RBR closer) (PP (TO to) (NP (DT the) (NN ground)))) (PP (VBN compared) (PP (TO to) (NP (NNP SCR) (NN technology) (NNS retrofits))))))))) (. .)))
FGD systems are usually constructed closer to ground in comparison to SCR technology.
( ( FGD systems ) ( ( are ( usually ( ( ( constructed ( closer ( to ground ) ) ) ( in comparison ) ) ( to ( SCR technology ) ) ) ) ) . ) )
(ROOT (S (NP (NNP FGD) (NNS systems)) (VP (VBP are) (VP (ADVP (RB usually)) (VBN constructed) (ADVP (RBR closer) (PP (TO to) (NP (NN ground)))) (PP (IN in) (NP (NN comparison))) (S (VP (TO to) (VP (VB SCR) (NP (NN technology))))))) (. .)))