( ( ( ( ( ( HI ( in ( ( star-forming ( elliptical galaxies ) ) ( ( The ( neutral ( hydrogen content ) ) ) ( of ( most ( elliptical galaxies ) ) ) ) ) ) ) ( is ( ( far lower ) ( than ( in spirals ) ) ) ) ) , ) and ) ( ( most ( giant ellipticals ) ) ( have ( ( a ( stellar population ) ) ( which ( ( is exclusively ) old ) ) ) ) ) ) . )
(ROOT (S (S (NP (NP (NNP HI)) (PP (IN in) (NP (NP (JJ star-forming) (JJ elliptical) (NNS galaxies)) (NP (NP (DT The) (JJ neutral) (NN hydrogen) (NN content)) (PP (IN of) (NP (JJS most) (JJ elliptical) (NNS galaxies))))))) (VP (VBZ is) (ADJP (ADJP (RB far) (JJR lower)) (PP (IN than) (PP (IN in) (NP (NNS spirals))))))) (, ,) (CC and) (S (NP (RBS most) (JJ giant) (NNS ellipticals)) (VP (VBP have) (NP (NP (DT a) (JJ stellar) (NN population)) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (ADVP (RB exclusively)) (ADJP (JJ old)))))))) (. .)))
HI in star-forming elliptical galaxies The neutral hydrogen content of most elliptical galaxies is far lower than in spirals, and most giant ellipticals have a stellar population which is exclusively old.
(ROOT (S (NP (PRP You)) (VP (VBP call) (NP (NP (JJ egg-shaped) (NNS galaxies)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBP are) (ADJP (JJ reddish) (S (VP (TO to) (VP (VB yellowish) (PP (IN in) (NP (NN color))) (SBAR (IN because) (S (NP (PRP they)) (VP (VBP contain) (NP (NP (ADJP (RB mostly) (JJ old)) (NNS stars)) (, ,) (NP (JJ elliptical) (NNS galaxies))))))))))))))) (. .)))