( Later ( we ( ( ( found ( in ( some ( additional researches ) ) ) ) ( ( the symmetry ) ( of ( ( pure ( rotational ( line shapes ) ) ) ( of ( ( hydrogen fluoride ) ( ( ( broadened ( by ( ( xenon and ) nitrogen ) ) ) ( in ( gas phase ) ) ) ( at ( room temperature ) ) ) ) ) ) ) ) ) . ) ) )
(ROOT (S (ADVP (RB Later)) (NP (PRP we)) (VP (VBD found) (PP (IN in) (NP (DT some) (JJ additional) (NN researches))) (NP (NP (DT the) (NN symmetry)) (PP (IN of) (NP (NP (JJ pure) (JJ rotational) (NN line) (NNS shapes)) (PP (IN of) (NP (NP (NN hydrogen) (NN fluoride)) (VP (VBN broadened) (PP (IN by) (NP (NN xenon) (CC and) (NN nitrogen))) (PP (IN in) (NP (NN gas) (NN phase))) (PP (IN at) (NP (NN room) (NN temperature)))))))))) (. .)))
Later we found in some additional researches the symmetry of pure rotational line shapes of hydrogen fluoride broadened by xenon and nitrogen in gas phase at room temperature.
(ROOT (S (NP (NNP Hydrogen)) (VP (VBZ is) (PP (IN in) (NP (NP (NN gas) (NN form)) (PP (IN at) (NP (NN room) (NN temperature)))))) (. .)))